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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.
Consider the table student and list names of students in the departments other than maths and computer. SELECT std_name FRM student WHERE dept_name NOT IN (‘Maths','Computer);
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Define blocks? The database system resides eternally on non-volatile storage, and is into fixed-length storage units known as blocks.
Now that she understands more about the benefits of databases, the play-scheme manager would like to extend the play-scheme database to include data for schools and instructors as
usecase diagram,activity diagraM,SEQUENCE DIAGRAM
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