MySQL 可以执行哪种字符串比较(区分大小写或不区分)?
当比较字符时,MySQL 不会执行区分大小写的比较。下面通过数据表“Employee”提供一个示例来阐释这一现象,其中数据如下 -
mysql> Select * from Employee; +----+--------+--------+ | ID | Name | Salary | +----+--------+--------+ | 1 | Gaurav | 50000 | | 2 | Rahul | 20000 | | 3 | Advik | 25000 | | 4 | Aarav | 65000 | | 5 | Ram | 20000 | | 6 | Mohan | 30000 | | 7 | Aryan | NULL | | 8 | Vinay | NULL | +----+--------+--------+ 8 rows in set (0.09 sec)
对于如下查询,结果集显示 MySQL 在比较字符时不区分大小写。
mysql> Select * from Employee WHERE Name IN ('gaurav','RAM');
+----+--------+--------+
| ID | Name | Salary |
+----+--------+--------+
| 1 | Gaurav | 50000 |
| 5 | Ram | 20000 |
+----+--------+--------+
2 rows in set (0.00 sec)
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