Can i use if else under a check constraint.
Can i use check constraint using a variable
need xplanation with eg.
Your question is a bit vague. What are you trying to do with the IF...ELSE? Check constraints aren't processed code, they're part of the table definition - there is no control flow and no variables. You can use a user-defined function in check constraints, which may be what you're after, but it's hard to tell from your question.
您不能使用IF/ELSE
,但是可以使用内联条件: CASE WHEN
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