qualifier in sql

The Source qualifier transformation provides SQL query options to overwrite the default query. You can enter the SQL statements that your source database supports. Before you enter the query, connect all the input and output ports that you want to

When using a sorted port, PowerCenter adds the port to the ORDER BY clause in the default query. PowerCenter Server adds the configured port number, starting at the top of the source qualifier conversion. You can use a sorted port to improve

You can add pre-and post-session SQL commands to the Properties tab of the Source qualifier transformation. You may want to use pre-session SQL to write the time identification row to the source table at the beginning of the session.PowerCenter runs

Join source dataYou can use a Source qualifier transformation to join data from multiple relational tables. These tables must be accessible from the same instance or database server.When mapping uses related relational sources, you can join two

If you want PowerCenter to select unique values from the source, you can use the Select different option. For example, you can use this feature to extract unique customer identities from a table that lists total sales. Using the Select Dissimilar

User defined join:Entering a user-defined join is similar to entering a custom SQL query. However, you only need to enter the contents of the WHERE clause instead of the entire query.When you add a user-defined join, the Source qualifier

In the second edition of the high performance MySQL, the time comparison between the SQL file and the definition character file in the backup and restore was seen.Method file size Export time restore timeSQL Dump 727M 102s 600sDelimited dump 669M

Abstract:There are many stored procedures in the system provided by SQL Server, but most of them are not commonly used. In practice, I summarized some common examples and introduced some examples. This article introduces: l sp_attach_dbl

To use PHP to operate a database is very simple, the corresponding entry of the phper can do, but when dealing with a large number of table operations, we are tired of many MySQL statements, so we are eager to wrap up a lot of database operations.

server| Create | Stored procedure stored procedures can make it much easier to manage the database and to display information about the database and its users. Stored procedures are precompiled collections of SQL statements and optional control flow