Informix Change Column Order

This was a solution that would have required involving our vendor. We can reverse the order by specifying in our sql command to change the order to Descending that is from Z to A. If necessary, change the environment variable DBDATE. Informix server can generate serial number automatically for the column with SERIAL data type. Indexed field changes: How to refresh DBGrid sort order. Indicate a name of the index in a database, uniqueness, name, and order of the indexed column(s). Using Lateral derived table in Informix Database Ajaykumar Gupte [email protected] Practical Issues in Database Management (chapter 9. All data for a row is stored on the same page, and SQL Server reads data page by page. You already know what indexes you have. To change column a from INTEGER to TINYINT NOT NULL (leaving the name the same), and to change column b from CHAR(10) to CHAR(20) as well as renaming it from b to c: ALTER TABLE t2 MODIFY a TINYINT NOT NULL, CHANGE b c CHAR(20); To add a new TIMESTAMP column named d: ALTER TABLE t2 ADD d TIMESTAMP;. statements with semicolons. I have googled many days and came to the conclusion by reading many posts that this seems not possible because there is syntax difference between MS SQL expressions and informix SQL expression for projecting queries. If I sum up the OrderCount column over time, for a specific OrderID, I will arrive at a number that is either positive, negative, or zero. Change a column data type. In this example, we've sorted the results by supplier_id / company_id in ascending order, as denoted by the ORDER BY 1. IBM To Purchase Informix Database 228 Posted by Hemos on Tuesday April 24, 2001 @09:02AM from the and-then-there-were-two dept. but with table name as first column""" rs. And for users created in the OS, if you need to change their password you must do it using the OS tools. patkey serial notetype char(4) order_no int The constraint is patkey, notetype and order_no. That is, you can change a column heading by using a column alias. The Informix Client SDK software allows you to connect to a local or remote Informix database server. Use the SELECT statement to retrieve values from a database or from an SPL or Informix® ESQL/C collection variable. They are introduced in Chapter 5,“Composing Advanced SELECT Statements. In order to install INFORMIX-CLI on Windows NT, you must have administrative privileges. Part 1 in this series, “Get Your Information in Order” (Oracle Magazine, September/October 2011), introduced readers to relational databases and the language chiefly used to interact with them: structured query language (SQL). I need some more advise & help from you on writing complex queries in informix. If I make a select on the first, order by on the second it takes forever. The following setup information for Informix describes how to install and configure Informix client software for Windows and UNIX systems. Hadoop integrates very well with Informix and DB2 databases with Sqoop. This prevents errors and can improve the accuracy and reliability of the database as a whole. Column Level. Thanks, _____ @Data is Delicious +++++ Where you see risk, I see opportunity!. They are special cases of more general recursive fixpoint queries, which compute transitive closures. Change a column data type. Tables with CHARACTER columns exceeding 2000 characters but less than 4000 characters. CUCM SQL Queries: Supplemental - Informix System Catalogs I recently fielded a request on Twitter (@ucguerrilla) for Cisco documentation that covers the database schema and structure. MyQuery_ByFirstName, MyQuery_ByLastName etc. KEY_COLUMN_USAGE GO. Code149 0 OP You need to be a member in order to leave a comment. An auto-generated key returned by the Informix driver is the value of a SERIAL column or a SERIAL8 column. This is easy to do when using in-line SQL statements. Server Studio™ is the premier graphical development and management environment that features a rich collection of modern tools which help both seasoned database professionals and novices alike manage IBM Informix® data servers infrastructure with an unprecedented ease and improved. Some databases (Oracle, DB2, PsotgreSQL) supports special virtual unique column which DBeaver can use to save changes. With CDC, you can be up and running immediately without changing the schema. HDR Change: There is a bug in Informix which forces us to run a dbspaceset=* backup when we have to do the HDR turn-on restore. To remove the left most '1' from the string '1234567896541' from the DUAL table, the following SQL statement can be used : SQL Code: SELECT TRIM(LEADING '1' FROM 1234567896541 ) AS LEADING_TRIM FROM dual; In the above example, the "LEADING_TRIM" is a column alias which will come as a column heading to the output. Hi Tariq, I checked the change into V18 - ADS 18. 4 and 10, these options will provide you with access to expert IBM Support professionals and will help you maintain business continuity until you upgrade to the latest version of Informix. Managing the WHERE Clause. Use the onstat -p and check the value of ckpwaits. I doubt that running through the hoops of going back and forth between SQL and PL/SQL engines is remotely comparable to the idea of simply not projecting a column in an ordinary query…. The following query will give the same result as the query above, just by using the PIVOT operator. Alias Column Syntax. Using IBM Informix database. The following might need to be dropped and recreated in order to change a column-level collation. November/December 2011. To be able to persist column value change table must have some unique key (primary key or unique index). If you wish to have the columns in a specific order, you will have to create a newtable, use INSERT INTO newtable (col-x,col-a,col-b) SELECT col-x,col-a,col-b FROM oldtable to transfer the data from the oldtable to the newtable, delete the oldtable and rename the newtable to the oldtable name. Let's choose a stored procedure for this purpose. 20 Jul 10 - IBM Announcements - IBM Informix Choice Edition V11. Indexed field changes: How to refresh DBGrid sort order. If the column data types do not match, then one type must be convertible to the other type. There are a number of ways to accomplish this, but a common one is to simply reissue the SQL query, but modifying the ORDER BY clause so that the results are properly ordered. The database engine uses values of the columns specified after the DISTINCT operator for evaluating the uniqueness of the row in the result set. Some inspiration from Mark Clerget and a little fooling around with SQL Query Analyzer resulted in the following. These ASC and DESC options are valid with B-trees only. Setting the "defaultValue" attribute will specify a default value for the column. Both of them find and display the publisher names and identification numbers from all three of the rows in the publishers table. These include queries, views, stored procedures, user-defined. 4 Informix Performance Informix databases include many advanced concepts such as parallel queries, multi-processor support, and virtual processors. By default, the compiler assumes SQL is written using standard Informix syntax. An alias only exists for the duration of the query. DatabaseSpy performs a validation of the column definition that will be used for the identifier column. By default, TEXT and BYTE columns are partition BLOBs (stored in-table). name, sTyps. List Columns: select tabname, colname, owner, coltype FROM syscolumns join systables on syscolumns. How to convert a table column to another data type Printer Friendly As Robert Treat pointed out in our PostgreSQL 8. The COLLATE clause optionally following each column name or expression defines a collating sequence used for text entries in that column. Informix has always been a great datamart and data warehouse server. Oracle "alter table" rename column Syntax example Oracle Database Tips by Donald Burleson. > I have a informix 4gl (report) program which basically taken data from a > temporary table which doesnot have order by clause but in the format > section > of the report order external by has been used. You can use either DESC or DESCRIBE statement. Removing a column from a large table can impact the performance of the database. 5 for Windows. OK, so I lied a bit there, there are overflow pages, but all columns start on the same page. Sometimes we want to change the name of a column. Hadoop integrates very well with Informix and DB2 databases with Sqoop. Note that the column sequence number is "0 seqno", which means the order of the columns is in the order returned by the database. order and, within each set of rows with the same manu_code (for example,. DBGrid - Changing order of fields. The following sections discuss the environment variables used by Informix products. -excludeColumns=type,catalog. Informix 11. The row_number clause or function is a complex construct that can associate an incremental number to a result set, but with very flexible options that allows the numbering to restart on specific conditions etc. All data for a row is stored on the same page, and SQL Server reads data page by page. This clause can define BLOB or CLOB storage attributes for a new column, or it can modify the current settings of those storage attributes for an existing column. If I specify order_no manually, the statement works but if I try to increment it within the query, it fails. So the conversion may be considered successful. 50 helps deploy low-cost scalable and reliable solutions for Apple Macintosh and Microsoft Windows Read 20 Jul 10 - IBM Announcements - Software withdrawal: Elite Support for Informix Ultimate-C Edition. Also, I sent it using the Power BI 32 bits version (at first I was using the 64 bits version but I downloaded the 32 bits version to test as well, sadly it didn't work too). For tutoring please call 856. HDR Change: There is a bug in Informix which forces us to run a dbspaceset=* backup when we have to do the HDR turn-on restore. There are many different reasons that one may have for requesting unique values from fields. net-mvc-4,entity-framework-5,informix. - [CORE-2563] - DiffChangeLog that adds columns does not preserve column order - [CORE-2565] - Escaping of the sequence names with schema generates invalid statements for Oracle DB - [CORE-2581] - mysql update emits incorrect sql for BIT(1) when default specified. Note: The connected user must have operating system write privileges in order to recreate a synonym. Practical Issues in Database Management (chapter 9. Browse all blog posts in the informatica-network blog in Informatica. This table violates third normal form because a non-key column, Discount, depends on another non-key column, SRP. You can use the UNION clause to combine table rows from two different queries into one result. Since Oracle does not have the same concept, detailed analysis of Informix clustered indexes may need to be done. 0 was the syntax of. Boyan Kostadinov just sent me a cool link to an article that is the final part in a four part series that discusses the SQL NULL value. An empty key value will be added to the first column family of each existing row to minimize the size of the projection for queries. In Informix, if the referenced table is different from the referencing table, you do not need to specify the referenced column; the default column is the primary key column (or columns) of the referenced table. There are two different methods to retrieve the list of Primary Keys and Foreign Keys from the database. tabid = sysviews. Download Presentation Informix SDS Tips & Panther Features An Image/Link below is provided (as is) to download presentation. By default, after executing a SELECT statement, the column heading(s) displayed in the result set is the name of the column in the table. Click the arrow and select the Connector that you want to use. 1 1 1 1 1 2 9 13 1 1 3. 2) I used to work with Informix SE. If the component supports the "DefaultCodePage" property, the code page from that property will be used. Informix DB is Informix Dynamic Server 9. LISTAGG is an aggregate function – meaning it is most often used with a group by to indicate within which groups a particular column should have the aggregation done. A custom sort order cannot be specified by just selecting the column. Some useful syntax reminders for SQL Injection into Informix databases… Below are some tabulated notes on how to do many of thing you'd normally do via SQL injection. The WHERE clause is the place to start your search for SQL you can change to get better performance. I have googled many days and came to the conclusion by reading many posts that this seems not possible because there is syntax difference between MS SQL expressions and informix SQL expression for projecting queries. DM_DEFAULT_CASE Case setting for matching SELECT columns with Prolifics variable names. We're going to follow steps 1 through 8 in the AWS instance changes section of the previous post to change the DBSERVERNAME from ol_aws to informix_1 and informix_2 and we're going to use the number in the DBSERVERNAME to map to a shard id. Tables with CHARACTER columns exceeding 2000 characters but less than 4000 characters. And besides, the column order on disk is not the column order you see. is it possible to create a autoserial index in order 1,2,3,4in Informix and Unload the data to a file, drop the table and recreate it with the new column. Then on the form add a combo box, value field and add the names of the columns. In order for column level privileges to be effective, the user should not have select or update privileges at the table level. This is implemented through use of a database table to store the value of the next order ID. In this column, we wanted to share some more thoughts that we didn't have room for in the main article. Owner/Schema. The order of the delete command "d" and the read file command "r" is important. Column independence means that you should be able to change any non-key column without affecting any other column. Informix doesn't seem to have a column to indicate the order of the column in the constraint. You'll be happy to hear that Hadoop is NOT a replacement for Informix or DB2, but in fact plays nicely with the existing infrastructure. In SQL Server, ROWVERSION and TIMESTAMP data types represent automatically generated binary numbers, unique within the database. As you can see, the results are identical in both databases. 3 is out and the Project Moves On , one of the features that was introduced in PostgreSQL 8. In Informix, if the referenced table is different from the referencing table, you do not need to specify the referenced column; the default column is the primary key column (or columns) of the referenced table. SQL DESC statement use for describe the list of column definitions for specified table. Informix Dynamic Server CHAR and NCHAR datatypes both store the same type of data, a sequence of single-byte or multibyte letters, numbers, and symbols. The row_number clause or function is a complex construct that can associate an incremental number to a result set, but with very flexible options that allows the numbering to restart on specific conditions etc. If I specify order_no manually, the statement works but if I try to increment it within the query, it fails. You can change column titles and column types (e. About This Manual The Informix Guide to SQL: Syntax is intended to be used as a. When you use a SELECT statement, you can name the columns and have them returned to you in the order that you desire. informix insert trigger: update value on same table but different record table with structure like this table 1 create table tegpriority ucidn bigint50 null. The order of the month, day, and year in a date To change the field. Boyan Kostadinov just sent me a cool link to an article that is the final part in a four part series that discusses the SQL NULL value. ) but DUAL can be accessed by every user. Installing the IBM Informix Virtual Appliance merely unpacks the archive; no additional changes are made to your system. (A column's default heading in a result is the source column's name in the table definition. In Informix, when you sort columns in ORDER BY clause NULL values go first for ascending order, and last for descending order. tabid; List Tables: select tabname, owner FROM systables; select tabname, viewtext FROM sysviews join systables on systables. If the DBMS doesn't support the elementary OLAP features, then the top- n. Dump Informix schema to text I needed "normalized" dump of Informix database so I can easily compare two databases. Its not time consuming. Changing the data structure of a column in SQL Server from NULL to NOT NULL, thereby disallowing non-null values in that column, is generally performed using the relatively simple ALTER TABLE syntax to appropriately change the column in question. SQL Server supports storing objects that have different collations in a single database. The main difference between the datatypes is the order the Informix Dynamic Server database server sorts the data. You can also change it at run-time using the SET SQL DIALECT command eg. Add an ORDER BY clause to change the order in which data isproduced. The reason being that they change the way the engine solves a query. The maximum number of columns allowed in a primary table marked for replication is four columns less than the maximum number of columns allowed by the Informix data server instance. Aliases are often used to make column names more readable. MySQL provides an easy mechanism for writing the results of a select statement into a text file on the server. Affordable and easy to use, Server Studio tools are specifically designed to enhance the performance of IBM Informix servers and help developers, DBAs and other IT professionals to manage efficiently and effectively the daily tasks, such as database back-end application development, schema management, storage space management, server maintenance, performance monitoring and optimization, that. This manual is valid only for the products in the preceding list. If the user has table level select or update privileges, these will override the column level privileges. Create a custom data item containing a new set of data to which, after applying the ascending or descending order, the data will show up as desired. Support the creation of DAX calculation groups in Power BI Desktop - otherwise Power BI can only consume calculation groups created in Analysis Services, whereas it would be very useful to have this feature in any Power BI model. I'm trying an invalid logging change. CREATE ROW TYPE meter_row. Introduction to Structured Query Language Version 4. The output of a SELECT query can be sorted in ascending or descending order on one or more columns, the default is ascending. The CREATE TABLE Statement is used to create tables to store data. I can manually insert running the following and increment the order_no. Informix clustered indexes mean the data is organized in the order of the clustered index. I haven't read the first three parts yet, but there is a really cool tip in the fourth part on using NULLIF() to prevent divide-by-zero errors in a SQL call. my table structure. As you can see, the results are identical in both databases. This article is focused on explaining Big Data and then providing simple worked examples in Hadoop, the major open-source player in the Big Data space. FAQ: What are the connection headers to be used while creating "reswords. drop Column; drop Default Value Does the sequence need to be guaranteed to be genererated inm the order of request? informix, hsqldb. So the conversion may be considered successful. I just sent the frown. To fix this problem, we have to use an alias that is different from the column name; see the following statement:. An alias data type based on a SQL Server system data type. We have install Informix Client on the Jobserver/Client and made ODBC connection too, everything works as expected apart from those tables. Each change is specified as a clause consisting of the column and column property to modify, separated by commas: Use either the ALTER or MODIFY keyword to initiate the list of clauses (i. Working with JSON Data from SQL The MongoDB support was introduced in 12. And for users created in the OS, if you need to change their password you must do it using the OS tools. Code149 0 OP You need to be a member in order to leave a comment. You can replicate any table, portion of a table, or view. You already know what indexes you have. 4 we can not use order by clause in a view create view viewname as select a,b from table1 order by b Now we are forced to change the. Hi, arify, thanks again for your reply. In order to achieve this we would need to be able to change how the query is solved. INTO Clause. Following are two examples. In this SQL UNION example, since the column names are different between the two SELECT statements, it is more advantageous to reference the columns in the ORDER BY clause by their position in the result set. Some useful syntax reminders for SQL Injection into Informix databases… Below are some tabulated notes on how to do many of thing you'd normally do via SQL injection. The main difference between the datatypes is the order the Informix Dynamic Server database server sorts the data. Its not time consuming. Integrity Constraints like primary key, unique key, foreign key can be defined for the columns while creating the table. Informix doesn't seem to have a column to indicate the order of the column in the constraint. The Informix TimeSeries data type uses a single row for each tag/tick identifier, such as a meter, and appends subsequent readings from the same meter to that row, as shown in Table 1. Informix under CONTROL: Online query processing. It is a data access language used for communicating with a database manager. You can specify a comma separated list of columns to be excluded, e. I have switched to IDS and it is way slower. You wouldn't want a variable to change on you as a side-effect of another action. SQL DESC statement use for describe the list of column definitions for specified table. MS- SQL Server is relational database management system. Create a custom data item containing a new set of data to which, after applying the ascending or descending order, the data will show up as desired. Indexing Service - Remote Catalog Access. Table structure. A TFDEventAlerter object - This is the objects used to handle the database change notifications. You can use either DESC or DESCRIBE statement. Generally, a comparison expression compares the contents of a table column to a literal, as above. On Windows 2000, you can do this by selecting "My Computer" on the desktop, pressing the right mouse button and selecting "Properties". Name Description Required For Supports Multiple Allowed Since; columns: Column constraint and foreign key information. you can get the same type of results in SQL SERVER also using the following Stored Proc CREATE procedure describe ( @tablename varchar(256) ) as begin SELECT distinct sCols. Please check mapping. To change column a from INTEGER to TINYINT NOT NULL (leaving the name the same), and to change column b from CHAR(10) to CHAR(20) as well as renaming it from b to c: ALTER TABLE t2 MODIFY a TINYINT NOT NULL, CHANGE b c CHAR(20); To add a new TIMESTAMP column named d: ALTER TABLE t2 ADD d TIMESTAMP;. 2 Important: This manual does not cover the product called INFORMIX-SQL or any other Informix application development tool. Managing the WHERE Clause. Changing an index, however, may affect all queries on the indexed table. non heading index columns. November/December 2011. There are two subtle actions that prevent this from working. Oracle "alter table" rename column Syntax example Oracle Database Tips by Donald Burleson. I am running into some problems while updating a column in the target table. If you delete the publication\subscriber and then delete rows from the original table(s), that is part of the view. * Information for Informix databases is not currently available. Analyzing UC Application Informix SQL Tables, Columns and Data Types Overview It is often necessary or useful to analyze a specific table’s columns and their associated data types when constructing queries for CUCM, CUCxN, UCCX etc. 50 helps deploy low-cost scalable and reliable solutions for Apple Macintosh and Microsoft Windows Read 20 Jul 10 - IBM Announcements - Software withdrawal: Elite Support for Informix Ultimate-C Edition. To remove the left most '1' from the string '1234567896541' from the DUAL table, the following SQL statement can be used : SQL Code: SELECT TRIM(LEADING '1' FROM 1234567896541 ) AS LEADING_TRIM FROM dual; In the above example, the "LEADING_TRIM" is a column alias which will come as a column heading to the output. Use the WHERE clause to UPDATE only specific records. 2 Important: This manual does not cover the product called INFORMIX-SQL or any other Informix application development tool. Latest trending topics being covered on ZDNet including Reviews, Tech Industry, Security, Hardware, Apple, and Windows. Aliases are often used to make column names more readable. Eclipse SQL Explorer [RCP/Plugin] Eclipse SQL Client for database querying/browsing any JDBC compliant database. In order to support a greater range of Informix DBMS releases, the current server release uses Informix Client SDK in its Adapter for Informix. The reason being that they change the way the engine solves a query. Click the 'Design' icon. Informix under CONTROL: Online query processing. If not used with group by, it is used on the only column returned in the select or subselect statement. also, a column showing %age of free space on a chunk is also desirable. If the data source is no longer at the same location, or if tables or columns are removed or renamed, the refresh will fail. com generates a license file with the additional count and sends it to the customer. length FROM [syscolumns] sCols INNER JOIN [systypes] sTyps ON sCols. Discussion boards, coding contests with prizes, and 2 thousand open programming jobs. Since Oracle does not have the same concept, detailed analysis of Informix clustered indexes may need to be done. SQL> select DATA_LENGTH. This is the only way to force all the equal values to be found together, as a group. CREATE TABLE and Generated Columns. And there's not much we could do. You can also. It contains information about every-thing you can do with INFORMIX-SQL, and it is organized by program name. Collations can be altered on a column level as well. MyQuery_ByFirstName, MyQuery_ByLastName etc. Putting all the NoSQL and MongoDB story aside, these new data types enable us to work with semi-structured data directly from SQL, thanks to several new built-in functions. The database engine uses values of the columns specified after the DISTINCT operator for evaluating the uniqueness of the row in the result set. HDR Change: There is a bug in Informix which forces us to run a dbspaceset=* backup when we have to do the HDR turn-on restore. They are introduced in Chapter 5,“Composing Advanced SELECT Statements. It provides a full suite of well known enterprise-level persistence patterns, designed for efficient and high-performing database access, adapted into a simple. First, specify the name of the table to which the column you want to change belong in the ALTER TABLE clause. The SELECT DISTINCT statement can be used along with conditions, such as specific columns, to retrieve unique field data from tables. Answer / satish asnani. to acquire column length the path of least resistance is to take the length from USER_TAB_COLUMNS e. If this option is selected, column data is retrieved dynamically from the data source at the time of the request. INTO Clause. IBM said Thursday that the optional Informix Warehouse Feature is now available and can be used to store and analyze data from Informix transaction systems. Boyan Kostadinov just sent me a cool link to an article that is the final part in a four part series that discusses the SQL NULL value. Unless you have very good knowledge of the Informix database, we recommend you leave them as they are: heading index columns; This refers to the leading component of an index and is set to high because the query optimizer can best optimize queries with exact information on such columns. e CREATE TABLE myTable( a int NULL, b varchar(50) NULL, c datetime NULL ); CREATE VIEW vw_myTable AS SELECT c, a, b FROM myTable; select * from myTable; a b c - - - select * from vw_myTable c a b - - -. Get max length of data for a column. The implementation and the syntax of the CREATE Statements differs for different RDBMS. In order for column level privileges to be effective, the user should not have select or update privileges at the table level. Well, as it turns out – this seems to be a common occurrence where Informix is involved. After you are familiar with INFORMIX-SQL basics, you can use the INFORMIX-SQL Reference Manual to learn about advanced features and to. Here the records are returned in the order by class from A to Z. It's a little more complicated, but a lot more flexible: select * from users join ( select * from ( select *, row_number() over ( partition by user_id order by created_at desc ) as row_num from. In order to store the BLOB data in a BLOBspace one must use the optional IN clause when creating the column. How To Compare Two Columns in Two Tables with SQL? 6 posts Compare the District and FINMumber column in the References table to the District and FIMNumber column in the CurrentFIMS table to. If you change the field separator before you read the line, the change affects what you read. StarQuest Data Replicator (SQDR) is a replication software product that allows you to copy data between IBM DB2, Oracle, Microsoft SQL Server, MySQL and Informix database environments. SQL TRIM() with leading character. how to change a column's data type. The following setup information for Informix describes how to install and configure Informix client software for Windows and UNIX systems. I have googled many days and came to the conclusion by reading many posts that this seems not possible because there is syntax difference between MS SQL expressions and informix SQL expression for projecting queries. Hi, Here is a query I need to create. This is easy to do when using in-line SQL statements. It also allows performing aggregations, wherever required, for column values that are expected in the final output. You can override it with a column alias. Hi Louise, I was hoping that the max open cursors was on a condition that could be avoided. A programming language with hidden side effects is broken, and should not be trusted. Type objects are supplied to Table definitions and can be supplied as type hints to functions for. Change a column data type. To fix this problem, we have to use an alias that is different from the column name; see the following statement:. This order is always maintained. LISTAGG is an aggregate function – meaning it is most often used with a group by to indicate within which groups a particular column should have the aggregation done. An explanation of how to find rows with duplicate values in a table using SQL. SQL DESC statement use for describe the list of column definitions for specified table. To do this, we use the ALTER TABLE Modify Column command. INFORMIX-4GL Reference Manual Version 7. Note: The connected user must have operating system write privileges in order to recreate a synonym. order by pctused desc The query will display the following columns: sid - session id of the user thread longtx - 1 if in long transaction already logbeg - begin log of this transaction ltxhwm - long transaction high water mark set in onconfig logfiles - number of logical logs currlog - current log used by the instance. Evaristo, The wrong online order for BLOB and CLOBis a bug , bug no: 4119713, this has been fixed in the just released (30 March 2005) developers release of version 10. Create an account. 2) If you've indexed columns a,b then the Informix documentation (OnLine Dynamic Server Performance Guide) indicates that just using b in the order by clause will *not* use the composite index, as you've experienced. If I make a select on the first, order by on the second it takes forever. Get max length of data for a column. The reason is that we used shippeddate as the alias for the output of the DATE_FORMAT function, which is a string, the ORDER BY clause took the alias and sorted the orders based on string values, not date values. So, although id is primary key and can not be null value, you don't need to insert value for it. No matter the length of the value in that field, the SQL always returns a full length value. name in the select. As you can see, the results are identical in both databases. You can clean up the UI later. SQLAlchemy provides abstractions for most common database data types, and a mechanism for specifying your own custom data types. order in DBgrids and stuff. In order to support a greater range of Informix DBMS releases, the current server release uses Informix Client SDK in its Adapter for Informix. In order to perform grouping, the set of selected rows must be ordered on the same columns. is it possible to create a autoserial index in order 1,2,3,4in Informix and Unload the data to a file, drop the table and recreate it with the new column. You can also. 5 for Windows. StarQuest Data Replicator (SQDR) is a replication software product that allows you to copy data between IBM DB2, Oracle, Microsoft SQL Server, MySQL and Informix database environments. Slow Indexes, Part II The previous section explained how to gain additional benefits from an existing index by changing its column order, but the example considered only two SQL statements.