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Asked: 2026-05-11T05:20:44+00:00

I have a table in my database in which records conceptually can be children

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I have a table in my database in which records conceptually can be children of other rcords. The table has a non-null name field. I need to ensure that each name in a set of children is unique, but not across the entire database. I’d like to enforce this using a constraint inside the Database. What’s the best way to accomplish this? I know that I am going to have to do a query at some point in the process like this:

@NameParameter NVARCHAR(512) Select Name from MyTable WHERE Name=@NameParameter

The question is where do I put this query?

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  1. I may not be understanding your question correctly, but my suggestion is to create another column that references the parent record of the child. You could then create a A multiple-column index based on those two columns to speed up any queries that reference these columns together in a where clause… Thus your uniqueness would come from {parent_name, child_name}. A constraint on these two columns would act as a key for that table, and not allow duplicates.

    @childname NVARCHAR(255), @parentname NVARCHAR(255) SELECT * FROM [child_records]  WHERE [parent_name] = @parentname  AND [child_name] = @childname
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