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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.
Given the subsequent relations: vehicle (reg_no, make, colour) Person (eno, name, address) Owner (eno, reg_no) Write expressions
What is a hash index? A hash index organizes the search keys, with their associated pointers, into a hash file structure.
entity relationship diagram for online examination system
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how to make an e r diagram?
Hi I have got an assignment for making an er diagram for market management software can any budy help me?
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