Learn some of the best practices for using joins and subqueries in SQL, such as choosing the right join type, avoiding unnecessary subqueries, and optimizing performance.

I'm trying to assign rows in a table to a random variable entirely in Transact SQL (This is MS SQL Server 2000, sp3). I've got it working perfectly except I can't use a variable inside my subquery ...

A subquery is a query that is nested inside a SELECT, INSERT, UPDATE, or DELETE statement, or inside another subquery. Correlated subqueries: Reference one or more columns in the outer SQL statement.

Subqueries (SQL Server) [!INCLUDE SQL Server Azure SQL Database Synapse Analytics PDW] A subquery is a query that is nested inside a SELECT, INSERT, UPDATE, or DELETE statement, or inside another ...

the subquery against the DB2 data is sent through the SAS server to the DB2 server and the rows for the divisions in the southeast region are returned to your local SAS session, where they are joined ...

Normalized data giving you problems? Learn how to use the SQL subselect statement and handle your database like a pro!