July 2014
Intermediate to advanced
214 pages
4h 47m
English
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Subqueries
A subquery is a query that is nested inside a SELECT, INSERT, UPDATE, or DELETE statement, or inside another subquery. Subqueries are often used in situations where a query depends on the results of another query. SQL Server supports noncorrelated and correlated subqueries.
In a noncorrelated subquery, the inner query is independent and gets evaluated first, then passes results to the outer query. A noncorrelated (independent) subquery can be independently evaluated and relies only on its own SELECT clause for instructions.
In a correlated subquery, the outer query provides values for the dependant inner subquery evaluation. SQL Server passes the subquery results back to the outer query for evaluation. A correlated (dependant) subquery ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.