query-expression is described in query-expression . USER is a literal that references the userid of the person who submitted the program. The userid that is returned is operating environment-dependent ...

A query-expression is one or more table-expressions. Multiple table expressions are linked by set operators. The following figure illustrates the relationship between table-expressions and ...

Many people are confused by various JOIN operations supported by SQL. Learn to master the SQL command line with this crash course in JOIN syntax.