Using Subqueries , Groupby and Having in MySql

1. Sub-queries In MySql

2. Subqueries
● SELECT statement embedded in a clause of another SELECT
statement.

3. Subqueries - Syntax
SELECT /* outer statement begins */
Table_1.column_1,
Table_1.column_2
FROM Table_1
WHERE
Table_1.column_1 =
(SELECT * /* subquery begins */
FROM Table_2
WHERE Table_2.column_1 = 5);

4. Comparison Operators in Subqueries
❖ All
❖ Any
❖ Some
❖ In

5. Example

6. Cont.
With Subquery (ALL):
Find max salary and empno using Subquery in single table.

7. cont.
Without Subquery (ALL):

8. cont.
Without Subquery (Any):

9. cont.
With Subquery (All):

10. Group By And Having Clauses
Example Showing How Group By and Having Differs:

11. cont.
Group by:

12. cont.
Having: