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 indexes on a the tables of a large database make a huge difference in its performance and utility. Without an index, locating a single record in a large table can take several seconds; with the ...

PROC SQL allows you to specify the ORDER BY clause in the CREATE VIEW statement. Every time a view is accessed, its data are sorted and displayed as specified by the ORDER BY clause. This sorting on ...