Gordon Pollokoff


SQLServerCentral Article

A Case Study in Performance Tuning

SQL Server does a wonderful job of tuning itself, selecting the optimum query plans and in general performing very well under a variety of conditions. That does not mean the a good DBA cannot add value by setting up the system and ensuring the optimizer receives the information that it needs. New author Gordon Pollokoff brings us a short case study from a project he as recently involved in where a new application required a bit of tuning.

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2005-01-24

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BIT_COUNT II

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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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