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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.
Which two files are used during operation of the DBMS? Data dictionary and transaction log are two files used during operation of the DBMS.
how many types of data model in DBMS? explain data abstraction with its different level
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