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Primary Key Primer for SQL Server

Every database developer uses keys, but without always understanding all the ramifications. They come with few hard and fast rules, but if you get them right from the start with a database design, the whole process of database development is simpler, and the result is likely to perform better. We asked Phil for advice, little knowing that the explanation might take a while.

2013-12-19

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Question of the Day

BIT_COUNT() IV

In SQL Server 2025, I run this code:

select bit_count('A')
What is returned?

See possible answers