A table-expression is a SELECT statement. It is the fundamental building block of most SQL procedure statements. You can combine the results of multiple table-expressions with set operators, which ...

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple ... table that contains values from two tables, where the record satisfies the WHERE expression.

Multiple table expressions are linked by set operators. The following figure illustrates the relationship between table-expressions and query-expressions. produces rows that are common to both ...