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09.19.2007 at 10:56AM PDT, ID: 22839413
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9.5

T-SQL Join based upon Computed Column?

Asked by adworldmedia in SQL Query Syntax, MS SQL Server

Tags: , , , ,

I am trying to figure out if its possible to do a T-SQL join on two tables based upon a Computed column?
The two tables have a CD number, in one table there is a preceding "0" after the CD and their associated number.  The other table does not have the 0.

So I have computed a column that elminates the "0", but I would like to join based upon that.  It does not seem possible.  Any thoughts would be greatly appreciated.

Here's the T-SQL I'm playing with:

SELECT     CASE WHEN LEFT(cdnum, 3) = 'CD0' THEN REPLACE(LEFT(cdnum, 6), 'CD0', 'CD') WHEN LEFT(cdnum, 3) <> 'CD0' THEN LEFT(cdnum, 6) END AS PublisherID,
                      CASE WHEN LEFT(logins.CD, 3) = 'CD0' THEN REPLACE(LEFT(logins.CD, 6), 'CD0', 'CD') WHEN LEFT(logins.CD, 3) <> 'CD0' THEN LEFT(logins.CD, 6)
                      END AS CDModID, aaw_stats.cdnum, logins.CD, logins.login, logins.password, logins.firstname, logins.lastname, logins.dateadded, logins.pubid,
                      aaw_stats.publisher
FROM         aaw_stats LEFT OUTER JOIN
                      logins ON PublisherID = logins.CD

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[+][-]09.19.2007 at 11:05AM PDT, ID: 19922963

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About this solution

Zones: SQL Query Syntax, MS SQL Server
Tags: join, case, sql, column, computed
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Solution Provided By: angelIII
Participating Experts: 2
Solution Grade: A
 
 
[+][-]09.19.2007 at 11:26AM PDT, ID: 19923154

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[+][-]09.19.2007 at 11:28AM PDT, ID: 19923171

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