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06/16/2004 at 07:40AM PDT, ID: 21027457
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7.8

Need help converting correlated subquery to a join...

Asked by jamesreddy in MS SQL Server

Tags: coorelated, subqueries, convert, correlated

Ok.  I taught Microsoft SQL Server(on an introductory level) but I am having a hard time with this.  I've been trying to expand my knowledge, if you will, on SQL.  In my travels, I discovered that it becomes more efficient, many times, to convert subqueries to joins (when possible).  I have, in fact, been practicing and converting many such statements to joins.  THEN I came across this statement in a sample database I downloaded:

SELECT ArtistName FROM Artists
WHERE ArtistID IN
( SELECT ArtistID FROM ArtistCDs WHERE CompactDiscID IN
( SELECT CompactDiscID FROM CompactDiscs WHERE CDTitle = 'Past Light' ) ) ;

Coorelated subquery.  Never saw one before.  I'm not entirely sure I understand what the above statement even means.  I'm having a hard time translating it.  In any event, if I knew what the above statement was asking for, I might be able to convert it to a JOIN statement.  Could some assist me in telling me what this subquery is asking for?  You can use my example or another...I'm just looking for a better understanding of correlated subqueries.

Thanks in advance.

James
[+][-]06/16/04 07:50 AM, ID: 11325051

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[+][-]06/16/04 07:52 AM, ID: 11325075

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Zone: MS SQL Server
Tags: coorelated, subqueries, convert, correlated
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Solution Provided By: ScottPletcher
Participating Experts: 5
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[+][-]06/16/04 07:52 AM, ID: 11325085

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[+][-]06/16/04 07:54 AM, ID: 11325104

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[+][-]06/16/04 08:01 AM, ID: 11325182

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[+][-]06/16/04 08:11 AM, ID: 11325291

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