Edward Haynes

Over 20 years experience in SQL Server development & administration, and creator of "Query Shaping" an innovative SQL query optimisation technique.
Find me on LinkedIn:
https://www.linkedin.com/in/edward-haynes-sql/

Technical Article

sp_PerfSQ

A diagnostic tool for identifying Performance features of active SQL Queries. It collects performance detail from DMVs for queries with executing requests and is designed to demonstrate and quantify Query Shaping optimisation techniques by: quantifying query workload and throughput characteristics providing behavioural descriptors of potential performance inhibitors - refer column ThrottlePotential The ThrottlePotential column is […]

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2019-11-07

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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;

See possible answers