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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)