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Anshuman Singh 2023-07-16 02:27:31 +05:30
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05-aggregate-subqueries.md
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@ -57,7 +57,7 @@ Note that, we can only use the columns in SELECT which are present in Group By b
5. Order by, limit, offset.
```
#### Examples
### Examples
***Q1: Print the name of every actor (first_name, last_name) and with that print the number of films they have acted in.***
@ -79,7 +79,7 @@ GROUP BY a.actor_id
SELECT userid, AVG(attended) FROM user_classes GROUP BY userid
```
#### Group by on multiple columns
### Group by on multiple columns
**Table: companies_users**
@ -159,7 +159,7 @@ SELECT * FROM employees WHERE salary > (SELECT AVG(salary) FROM employees)
As you can see, in SQL, it's possible to place a SQL query inside another query. This inner query is known as a subquery.
In a subquery, the outer query's result depends on the result set of the inner subquery. That's why subqueries are also called nested queries.
#### More examples
### More examples
***Q: Find all employees who make more salary than their department average.***