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9.1

Using the same select data twice in a query

Asked by KurtVon in SQL Query Syntax, MySQL Server

Tags: MySQL, MySQL, SQL, JDBC

I have a table containing row, col, and value data, and need to do a selection to filter out rows based on a (col, value) pairs.  I know the select to do this is

SELECT * FROM x WHERE row IN (SELECT row FROM x WHERE col = 'name' AND value = 'John') AND row IN (...) AND etc.

The problem is that in my case x is a very cost intensive select call itself, and I'd like to avoid assembling a temporary table if I can.  I tried the obvious

SELECT * FROM x AS T WHERE row IN (SELECT row FROM T WHERE col = 'name' AND value = 'John')

but sadly it didn't work, complaining T was undefined.

So I'm looking for either a way to reduce the enormous redundancy quoting all of x will cause or a better way to filter the rows.

Thanks for taking the time to read this.
[+][-]07/25/08 01:36 PM, ID: 22092092Expert Comment

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[+][-]07/25/08 03:12 PM, ID: 22092676Accepted Solution

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Zones: SQL Query Syntax, MySQL Server
Tags: MySQL, MySQL, SQL, JDBC
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Solution Provided By: matthewrhoades
Participating Experts: 1
Solution Grade: A
 
[+][-]07/28/08 05:47 AM, ID: 22102505Author Comment

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[+][-]07/28/08 08:58 AM, ID: 22104325Expert Comment

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[+][-]07/28/08 02:06 PM, ID: 22106815Expert Comment

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[+][-]07/28/08 02:24 PM, ID: 22106946Author Comment

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