2014-02-19
2,647 reads
T-SQL
2014-02-13
2,609 reads
2014-02-12
2,577 reads
2014-02-10
2,453 reads
The Performance of the T-SQL Window Functions
Window Functions in SQL greatly simplify a whole range of financial and statistical aggregations on sets of data. Because there is less SQL on the page, it is easy to assume that the performance is better too: but is it? Dwain gets out the test harness to investigate.
2014-02-06
5,354 reads
Sending a Variable Number of Elements in a Parameter
What are your options for sending a variable number of choices in a parameter to a stored procedure? Alex Grinberg looks at three techniques you can use.
2014-02-06
9,446 reads
Finding “Active” Rows for the Previous Month (SQL Spackle)
SQL Server MVP Jeff Moden walks us through the classic problem of finding all the "Active" rows for the previous month using start and end dates. This is excellent for those new to T-SQL.
2014-01-30
8,784 reads
Calculating Duration Using DATETIME Start and End Dates (SQL Spackle)
It's an old problem with a solution that's nearly as old. SQL Server MVP Jeff Moden shows us the old trick mixed with a slick trick to format the duration as extended hours, minutes, seconds, and milliseconds.
2015-04-03 (first published: 2014-01-16)
64,139 reads
2014-01-15
2,011 reads
2014-01-13
1,770 reads
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Question of the Day
BIT_COUNT I
In SQL Server 2025, I have a table (dbo.UserPermission) that contains this data:
UserID UserPermissions 15 23 37What is returned when I run this code:
select bit_count(UserPermissions) as PermissionCount from dbo.UserPermission where UserID = 3;See possible answers