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USING EXISTS with CO-RELATED SUB-QUERIES

Posted By: Adalicia Fischer     Category: Oracle     Views: 3216

This article explains about USING EXISTS with CO-RELATED SUB-QUERIES with example.

Customer - orders - salespeople database

USING EXISTS with CO-RELATED SUB-QUERIES

Find salespeople who having multiple(more than 1 customers)

SELECT DISTINCT snum FROM Customers outer WHERE EXISTS (SELECT * FROM Customers inner 
WHERE inner.snum=outer.snum AND inner.cnum <> outer.cnum);
  
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Adalicia Fischer
Adalicia Fischer author of USING EXISTS with CO-RELATED SUB-QUERIES is from Frankfurt, Germany.
 
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