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 ...

A common type of join is an equijoin, in which the values from a column in the first table must equal the values of a column in the second table. PROC SQL can process a maximum of 32 tables for a join ...

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 ...

Analyze database contents using basic, intermediate and advanced SQL statement syntax and usage. Demonstrate capability to query data from multiple tables using SQL JOINS. Create and modify database ...