IS NULL and IS MISSING are used in the WHERE, ON, and HAVING expressions. Each predicate resolves to true if the sql-expression's result is missing and false if it is not missing. SAS stores a numeric ...

The EXISTS condition is an operator whose right operand is a subquery ... Thus, the query returns all the employees from PROCLIB.PAYROLL who live in CT. proc sql; select * from proclib.payroll p where ...

This facet is why a view may be described as simply a “named” query. As one composes SQL Select statements, the author may use another query in place of any table or view. Even individual columns may ...