PLS-01455: The predicates IS NULL and IS NOT NULL are defined only for column specifications
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
PLS-01458
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PLS-01455The predicates IS NULL and IS NOT NULL are defined only for column specifications