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 INNER JOINS: Matching records only In December 2001’s “Another crash course in SQL,” I showed you one way to extract information from two tables in one statement. In most implementations ...

Simply join two SELECT statements with the UNION keyword to combine the results of two queries into a new table. When working with databases other than Microsoft's SQL Server, check the manual to ...