Database Error Messages

The predicates "IS NULL" and "IS NOT NULL" are defined only for column specifications, not for any other expressions. Section 5.15, "null predicate", indicates that in the predicate "x IS NULL", x must be a column, and may not be any other kind of expression.

The predicates "IS NULL" and "IS NOT NULL" are defined only for column specifications, not for any other expressions. Section 5.15, "null predicate", indicates that in the predicate "x IS NULL", x must be a column, and may not be any other kind of expression.

The predicates "IS NULL" and "IS NOT NULL" are defined only for column specifications, not for any other expressions. Section 5.15, "null predicate", indicates that in the predicate "x IS NULL", x must be a column, and may not be any other kind of expression.