C2H50H C2H50H - 8 months ago 80
SQL Question

Table Constraint

How would I go about adding this table constraint in SQL
If C# is BETWEEN 3000 AND 4000 then control has to be less than 60?

constraint c#_IS check(IF C# BETWEEN 3000 AND 4000 THEN control <= 60)


You can phrase it like this:

constraint c#_IS check ( (C# NOT BETWEEN 3000 AND 4000) OR (control <= 60) )

If you think about the logic, then this does what you want. If C# is not between the limits, then it returns true. But if it is between the limits, then control also has to meet the condition specified.