Mysql中的左移，右移

• 左移

mysql> select 2<< 1;
+-------+
| 2<< 1 |
+-------+
|     4 |
+-------+
1 row in set (0.02 sec)

• 右移

mysql> select 4 >> 2;
+--------+
| 4 >> 2 |
+--------+
|      1 |
+--------+
1 row in set (0.00 sec)