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T-SQL Window Functions Speed Phreakery

Before SQL Server had SQL window functions, SQL Server developers had to use all manner of tricks and algorithms to come up with ways to rapidly process large amounts of data. Do we need these techniques now that we can express a SQL task in terms of window functions? Kathi revisits a famous SQL challenge to find out.

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The Zen of Code Reviews: Best Practices

If you don't feel that you are getting helpful and comprehensive feedback from code reviews, it may well be your fault. Unless you are considerate to your reviewers in a number of ways, they might find it difficult to check your code and provide helpful advice. What ways? Michael Sorens outlines the eight golden rules that, if you follow them, might even even make your code a pleasure to review!

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Question of the Day

BIT_COUNT II

In SQL Server 2025, I have a table (dbo.UserPermission) that contains this data:

UserID  UserPermissions
15
23
37
4       NULL
What is returned when I run this code:
select bit_count(UserPermissions) as PermissionCount
from dbo.UserPermission
where UserID = 4;

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