Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...

The USING clause allows you to store DBMS connection information in a view by embedding the SAS/ACCESS LIBNAME statement inside the view. When PROC SQL executes the view, the stored query assigns the ...

In addition to using subselects to examine data in related tables, it’s also possible to use an aggregate function in a WHERE clause subselect to make a determination about the primary result set.

DB2, Microsoft SQL Server, Oracle and PostgreSQL all support recursive queries using CTEs. Note that Oracle also offers an alternative syntax using the CONNECT BY construct, which we will not discuss ...