标签：ble cdc racket eve ace binary bec 缺省 var
show Variables like ‘%table_names‘
查看lower_case_table_names的值，0代表区分，1代表不区分
1.用ROOT登录，修改/etc/my.cnf
2.在[mysqld]下加入一行：lower_case_table_names=1
3.重新启动数据库即可。
其中0：区分大小写，1：不区分大小写
1、数据库名与表名是严格区分大小写的；
2、表的别名是严格区分大小写的；
3、列名与列的别名在所有的情况下均是忽略大小写的；
4、变量名也是严格区分大小写的；
MySQL在Windows下都不区分大小写。
mysql默认是对字母的大小写不区分的
mysql> create table t1(
-> username varchar(10));
Query OK, 0 rows affected (0.09 sec)
mysql> insert into t1 values(‘you‘),(‘You‘),(‘YOU‘);
Query OK, 3 rows affected (0.05 sec)
Records: 3 Duplicates: 0 Warnings: 0
对这个表，缺省情况下，下面两个查询的结果是一样的：
mysql> select * from t1 where username = ‘you‘;
+------+
| username |
+------+
| you |
| You |
| YOU |
+------+
3 rows in set (0.00 sec)
mysql> select * from t1 where username = ‘YOU‘;
+------+
| username |
+------+
| you |
| You |
| YOU |
+------+
3 rows in set (0.00 sec)
如果想让MYSQL知道你输入的字母是大写还是小写的，修改表：
mysql> alter table t1 change username username varchar(10) binary;
Query OK, 3 rows affected (0.20 sec)
Records: 3 Duplicates: 0 Warnings: 0
mysql> select * from t1 where username = ‘you‘;
+------+
| username |
+------+
| you |
+------+
1 row in set (0.00 sec)
mysql> select * from t1 where username = ‘YOU‘;
+------+
| username |
+------+
| YOU |
+------+
1 row in set (0.00 sec)
如果你只是想在SQL语句中实现的话：
mysql> select * from t1 where username = binary ‘YOU‘;
+------+
| username |
+------+
| YOU |
+------+
1 row in set (0.02 sec)
mysql> select * from t1 where username = binary ‘you‘;
+------+
| username |
+------+
| you |
+------+
1 row in set (0.00 sec)
标签：ble cdc racket eve ace binary bec 缺省 var
原文地址：https://www.cnblogs.com/SimpleHe/p/14892692.html
