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When you're programming in SQL, you often have the choice of using table variables or temporary tables. This blog considers whether one method is substantially quicker than the other (spoiler alert: not really).
Posted by Andy Brown on 02 March 2017
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Are Temporary Tables or Table Variables Quicker in SQL?
This blog assumes that you already know what temporary tables and table variables are (if you don't, you could do worse than read our blogs (here or here) or watch our video tutorials (here or here) on the subject - or go on our advanced SQL course).
Here are the contents of the rest of this blog:
|The example used||Explaining the methodology behind this speed comparison|
|Temporary tables||The SQL code to generate and test a temporary table|
|Table variables||The same code to generate and test a table variable|
|Conclusion||The conclusion of the tests, giving relative speeds|
I'm running the tests in SQL Server 2016 under Windows 10 Professional, using this laptop:
The configuration of the laptop running these tests.
Let's start with the example I've used, which you can recreate in your own instance of SQL Server.