Introduction MySQL Tutorial

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  4. To override this order and group terms explicitly, use parentheses
mysql>
mysql> SELECT 1+2*3;
+-------+
| 1+2*3 |
+-------+
|     7 |
+-------+
1 row in set (0.00 sec)
mysql>
mysql> SELECT (1+2)*3;
+---------+
| (1+2)*3 |
+---------+
|       9 |
+---------+
1 row in set (0.00 sec)
mysql>