我的MysqL版本为5.6.14版本，是二进制包安装的（虽然是二进制包安装的，但是以下问题同样适用于源码安装包安装的MysqL）
[MysqL@ydrh2 ~]$ MysqL -uroot -p123456
Warning: Using a password on the command line interface can be insecure.
Welcome to the MysqL monitor. Commands end with ; or \g.
Your MysqL connection id is 1
Server version: 5.6.14-enterprise-commercial-advanced MysqL Enterprise Server - Advanced Edition (Commercial)
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Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
MysqL> insert into user(host,user,password) values("localhost","peter1",password("123456"));
ERROR 1046 (3D000): No database selected
MysqL> use MysqL;
Reading table information for completion of table and column namesYou can turn off this feature to get a quicker startup with -A
Database changed
MysqL> insert into user(host,password("123456"));
ERROR 1364 (HY000): Field 'ssl_cipher' doesn't have a default value
原因：在我的配置文件my.cnf中有这样一条语句
sql_mode=NO_ENGINE_SUBSTITUTION,STRICT_TRANS_TABLES
指定了严格模式，为了安全，严格模式禁止通过insert 这种形式直接修改MysqL库中的user表进行添加新用户
解决办法：
将配置文件中的STRICT_TRANS_TABLES删掉，即改为：
sql_mode=NO_ENGINE_SUBSTITUTION
然后重启MysqL即可