Notes/SQLNotes
1
0
Fork 0
mirror of https://github.com/robindhole/SQLNotes.git synced 2025-03-15 15:00:28 +00:00
Code Issues Packages Projects Releases Wiki Activity

format nit

Browse Source
This commit is contained in:
Anshuman Singh 2023-07-16 02:27:31 +05:30
parent 7e9218ed32
commit 240f94814a
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
05-aggregate-subqueries.md
View File

@ -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. 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.*** ***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 SELECT userid, AVG(attended) FROM user_classes GROUP BY userid
``` ```
#### Group by on multiple columns ### Group by on multiple columns
**Table: companies_users** **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. 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. 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.*** ***Q: Find all employees who make more salary than their department average.***