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How to add a column from a select query but the value from the new column will be the row count of the MySQL select query?
For this, you can use MySQL row_number(). Let us first create a table −
mysql> create table DemoTable1342 -> ( -> Score int -> ); Query OK, 0 rows affected (0.68 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1342 values(80); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable1342 values(98); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable1342 values(78); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1342 values(89); Query OK, 1 row affected (0.07 sec)
Display all records from the table using select statement −
mysql> select * from DemoTable1342;
This will produce the following output −
+-------+ | Score | +-------+ | 80 | | 98 | | 78 | | 89 | +-------+ 4 rows in set (0.00 sec)
Following is the query to add a column from a select query but the value from the new column will be the row count of the MySQL select query −
mysql> select Score,row_number() over() as `Rank` from DemoTable1342 order by Score DESC;
This will produce the following output −
+-------+------+ | Score | Rank | +-------+------+ | 98 | 1 | | 89 | 2 | | 80 | 3 | | 78 | 4 | +-------+------+ 4 rows in set (0.32 sec)
Updated on: 05-Nov-2019
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