Is a Primary Key necessary in SQL Server?

Question

This may be a pretty naive and stupid question, but I\'m going to ask it anyway

I have a table with several fields, none of which are unique, and a primary key, whic

Answer 1

Necessary? No. Used behind the scenes? Well, it's saved to disk and kept in the row cache, etc. Removing will slightly increase your performance (use a watch with millisecond precision to notice).

But ... the next time someone needs to create references to this table, they will curse you. If they are brave, they will add a PK (and wait for a long time for the DB to create the column). If they are not brave or dumb, they will start creating references using the business key (i.e. the data columns) which will cause a maintenance nightmare.

Conclusion: Since the cost of having a PK (even if it's not used ATM) is so small, let it be.