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  #1  
Old October 13th, 2000, 01:17 AM
Decius Decius is offline
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Very similar to selecting only those values in table1 that exist in table2 also, I want to select all those that exist in table1 but NOT in table 2.

I have no clue how to do this. I tried:

select table1.ID from table1, table2 where table1.ID <> table2.ID

but that does not work because it simply returns the rows in the reversed order.

select table1.ID from table1, table2 where table1.ID = table2.ID works for the opposite effect. (finding all rows where the value is same in the first and second table)

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Old October 13th, 2000, 07:28 AM
rod k rod k is offline
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You won't be able to do it in one query (until MySQL supports sub-selects).

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Old October 13th, 2000, 05:07 PM
JohnGray JohnGray is offline
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The answer posted here is incorrect - this is a standard LEFT JOIN query. see the other thread with this same topic at http://www.devshed.com/Talk/Forums/Forum5/HTML/003301.html

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Old October 14th, 2000, 07:20 AM
rod k rod k is offline
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I shouldn't answer posts before I've had my morning coffee....

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