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What is the difference between a HAVING CLAUSE and a WHERE CLAUSE?
HAVING CLAUSE
- HAVING CLAUSE is used only with SELECT statement.
- It is normally used in a GROUP BY clause in a query.
- If GROUP BY isn't used, HAVING works like a WHERE clause.
WHERE Clause
- It is applied to every row before they become a part of GROUP BY function in a query.
each publisher has uniqe name a mial addrs are also kept on each pubisher.a publisher publish one book.a book publish y one publisher.book identified by isbn.each book writn by one
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