Defines part or all of a
group-by-item <, group-by-item>...>
See SELECT Statement for complete information on the SELECT statement.
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 creates a query-expression. Use
one ORDER BY clause for an entire query-expression. Place a semicolon only
at the end of the entire query-expression. A query-expression is often only
one SELECT statement or table-expression.
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