ORA-01817: day of week may only be specified once

oracle

ORA-01817: day of week may only be specified once
Cause: More than one day-of-the-week format code was listed in a date specification. Only one of the following day-of-the-week format codes may be specified in a date: D, DY, DAY.
Action: Remove all but one day-of-the-week format from the date specification.

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