SQL : Sql Server - Constraint - Allow to set column A only if column B is null and vice-versa

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SQL : Sql Server - Constraint - Allow to set column A only if column B is null and vice-versa
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SQL : Sql Server - Constraint - Allow to set column A only if column B is null and vice-versa
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SQL Sql only Server Allow Constraint A column if : and - null to - set column is B vice-versa



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