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Checking for NULL with Oracle SQL – All Things Oracle
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日期：2025-11-15
I once received a check constraint something like the following from a vendor, all allegedly tested: check (sex in ('M','F',NULL)) Guess what happens with a constraint like that then? Which of the following are allowed: 'M', 'm', 'F', 'f' NULL, 'X', 'x', ...看更多
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