Rank function in MySQL?

The rank() function can be used to give a rank for every row within the partition of a result set.

First, let us create a table −

mysql> create table RankDemo
   mysql> (
   mysql> id int
   mysql> );
Query OK, 0 rows affected (0.53 sec)

Inserting records into table.

mysql> insert into RankDemo values(1);
Query OK, 1 row affected (0.19 sec)

mysql>  insert into RankDemo values(3);
Query OK, 1 row affected (0.12 sec)

mysql>  insert into RankDemo values(3);
Query OK, 1 row affected (0.11 sec)

mysql>  insert into RankDemo values(4);
Query OK, 1 row affected (0.12 sec)

mysql>  insert into RankDemo values(5);
Query OK, 1 row affected (0.17 sec)

Displaying all records from the table with the help of select statement. The query is as follows −

mysql> select *from RankDemo;

The following is the output.

+------+
| id   |
+------+
|    1 |
|    3 |
|    3 |
|    4 |
|    5 |
+------+
5 rows in set (0.00 sec)

Let us now apply the rank() function as I have discussed above.

mysql> SELECT
   mysql> id,RANK() OVER (ORDER BY id ) Ranking
   mysql> from RankDemo;

The following is the output that displays the rank.

+------+---------+
| id   | Ranking |
+------+---------+
|    1 |       1 |
|    3 |       2 |
|    3 |       2 |
|    4 |       4 |
|    5 |       5 |
+------+---------+
5 rows in set (0.04 sec)