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遇到这个报错？不知道怎么办？要哭了？
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual
that corresponds to your MySQL server version for the right syntax to use near
'("123456") where user='root'' at line 1
MySQL grant的SQL命令其实在5.X之后就已经被弃用了
首先，你先检查一下你的MySQL版本， 大多数执行报错的MySQL版本是8.0的。
1.先用MySQL 8.0试一下
mysql> grant all privileges on test.* to test@'%' identified by '123456';
这里报错
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual
that corresponds to your MySQL server version for the right syntax to use near
'identified by '123456'' at line 1
2.再用MySQL 5.7试一下
mysql> grant all privileges on test.* to test@'%' identified by '123456';
Query OK, 0 rows affected, 1 warning (0.08 sec) mysql> flush privileges;
正确的执行赋权
那么在MySQL8.0版本及以后，我们如何正确执行grant呢？
先创建用户，再赋予授权。
mysql> create user test@'localhost' identified by '123456';
Query OK, 0 rows affected (0.10 sec)
mysql> grant all privileges on test.* to test@'localhost';
Query OK, 0 rows affected (0.17 sec)
mysql> flush privileges;
Query OK, 0 rows affected (0.18 sec)
这个方法也适用MySQL5.7版本，所以建议大家以后使用这种方式赋权，一键建用户加赋权官方已经弃用了。