The advantage of using a multi-column unique constraint on a tiny table


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I have a SQL table with a primary key that typically has less than 100 records. It also has a unique restriction on a group of three columns, but that constraint isn't always valid, so I'm working around it. I'd want to remove the limitation, but I'm not sure if doing so will have any detrimental consequences. According to my investigation, there may be a performance hit. However, the table has such few rows that these three columns are never searched on. What are the reasons for this sort of restriction?

A constraint protects the integrity of data. Now, since what I read in this article by scaler says that occasionally the constraint is invalid, then suggests that duplicate values are anticipated in some situations. Is it necessary to assure uniqueness? So, what should I do now?