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using NOT EXISTS

Posted By: Arnelle Schmidt     Category: Oracle     Views: 2483

This article explains about using NOT EXISTS with example.

Customer - orders - salespeople database

using NOT EXISTS

Find all salespersons having only 1 customer.

SELECT DISTINCT snum FROM Customers outer WHERE NOT EXISTS  (SELECT * FROM Customers inner WHERE inner.snum=outer.snum AND inner.cnum <> outer.cnum);

 

  
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Arnelle Schmidt
Arnelle Schmidt author of using NOT EXISTS is from Frankfurt, Germany.
 
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