"Where" Clause vs "On" Clause

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What are the differences between Where Clause and On Clause ? Speed, execution, and the use

Posted 26-Jun-13 6:45am

sorawit amorn

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Thomas Daniels · Answer 1 · 2013-06-26T06:47:00

Solution 1

Hi,

Have a look here:
http://stackoverflow.com/questions/354070/sql-join-where-clause-vs-on-clause[^]
http://www.bennadel.com/blog/284-SQL-Optimization-And-ON-Clause-vs-WHERE-Clause.htm[^]

Posted 26-Jun-13 6:47am

Thomas Daniels

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sorawit amorn 26-Jun-13 13:08pm

I am looking for more descriptive explanation.

Zoltán Zörgő 26-Jun-13 13:20pm

Well, than look. WHERE clause is a general selection predicate, while ON is a join condition predicate. Of course, you can use WHERE for every join case - but that will be far more complex syntax. So the standard was expanded with the special JOIN clause. In general, RDBMS engines optimizer algorithms take special care of the JOIN clause.
What exactly do you want?