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Mysql中的逻辑运算【待完善】
1.代码如下：
mysql> select 1 or 0;
+----------+
| (1 or 0) |
+----------+
| 1 |
+----------+
1 row in set (0.01 sec)mysql> select (0 or 0);
+----------+
| (0 or 0) |
+----------+
| 0 |
+----------+
1 row in set (0.00 sec)