Help for a query
HI Everyone,
I am novice in terms of SQL knowledge , Can some one please explain how is the query executed:
SELECT DISTINCT store_type FROM stores s1
WHERE NOT EXISTS (
SELECT * FROM cities WHERE NOT EXISTS (
SELECT * FROM cities_stores
WHERE cities_stores.city = cities.city
AND cities_stores.store_type = stores.store_type));
I am very confused on this .
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Help for a query
February 26, 2013 11:46PM
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