FORMAT(X,D) formats the number X to a format like '#,###,###.##', rounded to D decimal places, and returns the result as a string : FORMAT « Math Numeric Functions « MySQL Tutorial

1. MySQL Tutorial
2. Math Numeric Functions
3. FORMAT

mysql>
mysql> create table myTable(
    ->   id           int(2),
    ->   value        FLOAT(6,2)
    -> );
Query OK, 0 rows affected (0.02 sec)

mysql>
mysql> insert into myTable(ID,  value)values (1,9);
Query OK, 1 row affected (0.00 sec)

mysql> insert into myTable(ID,  value)values (2,2.11);
Query OK, 1 row affected (0.00 sec)

mysql> insert into myTable(ID,  value)values (3,312312.44);
Query OK, 1 row affected, 1 warning (0.00 sec)

mysql> insert into myTable(ID,  value)values (4,-123124.21);
Query OK, 1 row affected, 1 warning (0.00 sec)

mysql> insert into myTable(ID,  value)values (5,11231230);
Query OK, 1 row affected, 1 warning (0.01 sec)

mysql> insert into myTable(ID,  value)values (6,3123123);
Query OK, 1 row affected, 1 warning (0.02 sec)

mysql> insert into myTable(ID,  value)values (7,-1231235.88);
Query OK, 1 row affected, 1 warning (0.00 sec)

mysql> insert into myTable(ID,  value)values (8,123.45);
Query OK, 1 row affected (0.00 sec)

mysql> insert into myTable(ID,  value)values (9,934534538.23);
Query OK, 1 row affected, 1 warning (0.01 sec)

mysql> insert into myTable(ID,  value)values (10,934534538.23);
Query OK, 1 row affected, 1 warning (0.00 sec)

mysql> insert into myTable(ID,  value)values (11,-934534584.23);
Query OK, 1 row affected, 1 warning (0.00 sec)

mysql> insert into myTable(ID,  value)values (12,193453458.23);
Query OK, 1 row affected, 1 warning (0.00 sec)

mysql> insert into myTable(ID,  value)values (13,-934534528.87);
Query OK, 1 row affected, 1 warning (0.00 sec)

mysql> insert into myTable(ID,  value)values (14,25.37);
Query OK, 1 row affected (0.00 sec)

mysql> insert into myTable(ID,  value)values (15,-934534518.3);
Query OK, 1 row affected, 1 warning (0.00 sec)

mysql> insert into myTable(ID,  value)values (16,3453459.23);
Query OK, 1 row affected, 1 warning (0.00 sec)

mysql> insert into myTable(ID,  value)values (17,-3453458.23);
Query OK, 1 row affected, 1 warning (0.00 sec)

mysql>
mysql> select * from myTable;
+------+----------+
| id   | value    |
+------+----------+
|    1 |     9.00 |
|    2 |     2.11 |
|    3 |  9999.99 |
|    4 | -9999.99 |
|    5 |  9999.99 |
|    6 |  9999.99 |
|    7 | -9999.99 |
|    8 |   123.45 |
|    9 |  9999.99 |
|   10 |  9999.99 |
|   11 | -9999.99 |
|   12 |  9999.99 |
|   13 | -9999.99 |
|   14 |    25.37 |
|   15 | -9999.99 |
|   16 |  9999.99 |
|   17 | -9999.99 |
+------+----------+
17 rows in set (0.00 sec)

mysql>
mysql> select value, format(value,2) from myTable;
+----------+-----------------+
| value    | format(value,2) |
+----------+-----------------+
|     9.00 | 9.00            |
|     2.11 | 2.11            |
|  9999.99 | 9,999.99        |
| -9999.99 | -9,999.99       |
|  9999.99 | 9,999.99        |
|  9999.99 | 9,999.99        |
| -9999.99 | -9,999.99       |
|   123.45 | 123.45          |
|  9999.99 | 9,999.99        |
|  9999.99 | 9,999.99        |
| -9999.99 | -9,999.99       |
|  9999.99 | 9,999.99        |
| -9999.99 | -9,999.99       |
|    25.37 | 25.37           |
| -9999.99 | -9,999.99       |
|  9999.99 | 9,999.99        |
| -9999.99 | -9,999.99       |
+----------+-----------------+
17 rows in set (0.00 sec)

mysql>
mysql> drop table myTable;
Query OK, 0 rows affected (0.00 sec)

mysql>