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Editorial Team
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Asked: 2026-06-13T13:54:10+00:00

What does a Transact SQL statement Select statement inside a from mean? I mean

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What does a Transact SQL statement Select statement inside a from mean?

I mean something like this 

 .. from ( 
    select .. 
 )

Also, I need to know if the statement is bad for performance. Can you provide me a link to the official documentation about this topic in Transact SQL?

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1 Answer

  1. Editorial Team

    I think you are talking about subquery. A subquery is used to return data that will be used in the main query as a condition to further restrict the data to be retrieved.

    Please refer this link:- http://www.tutorialspoint.com/sql/sql-sub-queries.htm

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