Calculating percentage in a MySQL query and round off the result

For this, you can use CONCAT() and round(). Let us first create a table −

mysql> create table DemoTable1844
     (
     Number int,
     TotalNumber int
     );
Query OK, 0 rows affected (0.00 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable1844 values(50,500);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1844 values(80,500);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1844 values(98,500);
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1844 values(45,500);
Query OK, 1 row affected (0.00 sec)

Display all records from the table using select statement −

mysql> select * from DemoTable1844;

This will produce the following output −

+--------+-------------+
| Number | TotalNumber |
+--------+-------------+
|     50 |         500 |
|     80 |         500 |
|     98 |         500 |
|     45 |         500 |
+--------+-------------+
4 rows in set (0.00 sec)

Here is the query to calculating percentage in a query and rounding off the result −

mysql> select concat(round(((Number / TotalNumber) * 100 ),2), '%') as Result from DemoTable1844;

This will produce the following output −

+--------+
| Result |
+--------+
| 10.00% |
| 16.00% |
| 19.60% |
| 9.00%  |
+--------+
4 rows in set (0.00 sec)