Hidden RBAR: Counting with Recursive CTE's
"Counting" is essential to many high performance code techniques. SQL Server MVP, Jeff Moden, shows us how to make sure that we're "Counting" and not "Crippling" our trick-code.
2011-08-08
22,777 reads
Jeff Moden
- Interests: SQL. When Im not having fun with that, then SQL. ;-)
Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs
In Part 1, we learned how to make both Cross-Tabs and Pivots. In Part 2, we'll learn how to automate a very common type of Cross-Tab report and maybe learn some extra tricks on the way.
2010-04-30 (first published: 2008-12-03)
51,961 reads
Passing Parameters as (almost) 1, 2, and 3 Dimensional Arrays
It's a well known fact that there's no such thing as a true "array" in SQL Server and that you can't pass a table as a parameter... but you can get a lot closer than you think.
2010-01-08 (first published: 2008-05-22)
34,134 reads
Dissecting SQL Server Execution Plans
A review of MVP Grant Fritchey's "Dissecting Execution Plans". This is one book that you'll want on your bookshelf.
2009-12-17
5,783 reads
Hidden RBAR: Triangular Joins
Just because it looks set based, doesn't mean it is. T-SQL Crackerjack Jeff Moden takes a look at a mistake that many query writers make.
2009-01-16 (first published: 2007-12-06)
60,416 reads
More RBAR and "Tuning" UPDATEs
SQL Server expert Jeff Moden discusses a common problem seen in many update statements.
2008-03-14
12,594 reads
Solving the "Running Total" & "Ordinal Rank" Problems in SS 2k/2k5
Learn how to solve a couple of common T-SQL issues with MVP Jeff Moden.
2008-01-31
17,870 reads
Performance Tuning: Concatenation Functions and Some Tuning Myths
Rumor has it that Concatenation functions have gotten the nasty reputation of being "performance hogs". Here's why that's not true.
2008-01-01
22,399 reads
Calculating Work Days
How many times have you wished that there was a parameter for DATEPART to allow you to check for workdays? While many of us may get stuck working 6 or 7 days a week, most of the world revolves on a 5 day work week. Monday through Friday. New author Jeff Moden brings us a method of easily calculating the number of workdays between any two dates.
2007-10-02 (first published: 2005-01-10)
73,947 reads
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Restoring On Top II
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SQL Art 2: St Patrick’s Day in SSMS (Shamrock + Pint + Pixel Text)
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Breaking Down Your Work
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Question of the Day
Restoring On Top II
I have a database, DNRTest, that has a number of tables and other objects in it. The other day, I was trying to mock up a test and ran this code on the same server:
-- run yesterday CREATE DATABASE DNRTest2 GO USE DNRTest2 GO CREATE TABLE NewTable (id INT) GOToday, I realize that I need a copy of DNRTest for another mockup, and I run this:
-- run today USE Master BACKUP DATABASE DNRTest TO DISK = 'dnrtest.bak' GO RESTORE DATABASE DNRTest2 FROM DISK = 'dnrtest.bak' WITH REPLACEWhat happens? See possible answers