Our Teradata instances are used as a DW for our DB2 mainframe application. In those DW tables, NULL values for date fields are instead represented by '1111-11-11'. I figure this was either done intentionally as part of the design (either mainframe or DW-side) or it was out of necessity due to NULL not being allowed in a DATE field.
I know Teradata 13 will accept NULL in a DATE field, but I was wondering if that was always the case? Was it not allowed in past versions?
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