PROC SQL allows a subquery (contained in parentheses) at any point in an expression where a simple column value or constant can be used. In this case, a subquery must return a single value, that is, ...

In SQL, the CASE statement functions like IF-THEN-ELSE logic in programming, offering a way to create branches in your query. It's useful for comparing values, evaluating expressions, or applying ...

Natively compiled T-SQL modules support CASE expressions in some versions of SQL Server. This example implements the CASE expression in a query. CASE expressions are supported in natively compiled ...

The CASE expression provides conditional SQL expressions. You can use case expressions anywhere you can use an expression. The syntax of the CASE expression is as follows: You cannot use a subquery as ...

Set operators follow this order of precedence unless they are overridden by parentheses in the expression(s): INTERSECT is evaluated first. OUTER UNION, UNION, and EXCEPT have the same level of ...