Category Archives: T-SQL
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Adding, altering or removing multiple columns from a table
2April 16, 2015 by Kenneth Fisher
I was recently asked to do some fairly heavy modifications to a table. It involved adding 6 new columns, removing …
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What is a CTE
1April 6, 2015 by Kenneth Fisher
CTEs (Common Table Expressions) are one of the most interesting and useful tools added to T-SQL in the last decade. …
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Clean out all bad characters from a string.
10March 25, 2015 by Kenneth Fisher
I have a customer who is having a problem with a load. He is getting a fair number of bad …
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Why not NOLOCK?
4March 18, 2015 by Kenneth Fisher
Most senior DBAs I’ve met shudder when they hear NOLOCK. Ever wonder why? For the same reason they shudder at …
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There are #temp tables and then there are ##temp tables.
Leave a commentMarch 16, 2015 by Kenneth Fisher
Temporary tables are a common enough thing in T-SQL that most of us have probably used them on a fairly …
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Who’s using that database?
Leave a commentMarch 9, 2015 by Kenneth Fisher
A common problem when trying to alter a database (take it offline, add a filegroup, whatever) is that someone else …
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Test your UPDATEs and DELETEs before you run them
14February 18, 2015 by Kenneth Fisher
This isn’t so much of a best practice, it comes more under the heading of being careful. Let’s say you …
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Tales of a DBA fed up with NOLOCK. Part 1
36February 16, 2015 by Kenneth Fisher
Nov 12, 2014 Dear Diary, They asked for help again. Every now and again everything slows down and they see …
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Dealing with layered function calls
5February 5, 2015 by Kenneth Fisher
T-SQL is not the best language in the world for formatting strings. It can be done, but typically you are …
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