PL/SQL: ORA-43918: This Argument Must Be A Literal
(Doc ID 2463944.1)
Last updated on FEBRUARY 19, 2019
Applies to:PL/SQL - Version 220.127.116.11 and later
Information in this document applies to any platform.
RDBMS version 12.2 has an extended syntax for CAST function which allows to handle format errors without usage of PL/SQL (and hence without context switch), This functionality works fine in standalone SQL statement -
Upgrade to 12.2
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