PLS-01455: The predicates IS NULL and IS NOT NULL are
defined only for column specifications

Answer Posted / guest

Cause: 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.

Action: none

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