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Editorial Team
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Asked: 2026-06-14T14:28:12+00:00

I am totally new to SQL Server management, I tried to add a constraint

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I am totally new to SQL Server management, I tried to add a constraint in a table.

The situation is that I created a column with only ‘Y’or ‘N’ allowed to be valued.

So I tried to create a constraint in Management Studio by right clicking “Constraints” in the table.

However, I really have no idea about the syntax of creating a constraint. Finally, I tried to input the code into “Check Constraint Expression” window by referring the template from the Internet. The SQL Server always tell me “Error Validating constaint”.

Can you guys just help me to write the first constraint for me? Because I really dont know how to start.

My requirement is:

I have a table called "Customer"
I created a column called "AllowRefund"
The column "AllowRefund" is only allowed to 'Y' or 'N'

Thanks.

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1 Answer

  1. Editorial Team

    I’d advise against what you are trying to do. There is a datatype (Bit) that is designed to represent values with two states. If you use this type you won’t even need the constraint at all. SQL Server will enforce the value to be either one or zero with no additonal work required. You just have to design your app to treat 1 as yes, and 0 as No.

    The approach you are attempting is just not a good idea and no good will come of it.

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