默认情况下,MySQL的核心配置文件在C:\ProgramData\MySQL\MySQL Server 5.7\my.ini(我们也可以将其复制到上面说的那几个目录) 需要注意的是,默认情况下MySQL会在提供一个文件:C:\Program Files\MySQL\MySQL Server 5.7\my-default.ini,MySQL并不会加载这个文件,这个文件只是MySQL提供给我们复制用的配置文件; Tips:...
mysql> revoke insert on sakila.* from 'z1'@'localhost'; Query OK, 0 rows affected (0.00 sec) mysql> exit Bye 用户z1 重新登录后执行前面语句: [mysql@db3 ~]$ mysql -uz1 -p123 Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 21763 to server v...
Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 7344941 to server version: 5.1.9-beta-log Type 'help;' or '\h' for help. Type '\c' to clear the buffer. mysql> 在以上命令行中,mysql 代表客户端命令,-u 后面跟连接的数据库用户,-p 表示需要输入密...
mysql>FLUSHPRIVILEGES; Query OK,0rows affected (0.00sec) mysql>exitBye[root@localhost ~]# mysql-uz1-p#System20 mysql:[Warning]Using a passwordonthe command line interface can be insecure. Welcometothe MySQL monitor. Commandsendwith;or\g. Your MySQL connection idis11Server version:5.7.17MySQL...
select * from mysql.user; 查看当前登录的用户: select user(); 4.1.2 创建用户 语法: CREATE USER '用户名'@'主机名' IDENTIFIED BY '密码'; 语法说明: Tips:用户名、主机名和密码都应该加上单引号 【案例1】: 创建zhangsan用户,只能在localhost这个服务器登录mysql服务器,密码为123456 ...
SQL DDL, DML, DCL Commands sqldmlddldcl UpdatedAug 23, 2022 TSQL Load more… Add a description, image, and links to thedcltopic page so that developers can more easily learn about it. To associate your repository with thedcltopic, visit your repo's landing page and select "manage topics...
使用新密码登录 [root@server01 ~]# mysql -uuser1 -p'321@abcABC' mysql: [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 13 Server version: 5.7.17-log MySQL Community Server...
select是用来挑选字段的,而where是用来挑选行的;mysql关系型数据库为一个行级数据库,所有数据先取行,然后对行过滤之后保留关键字段, ★单表查询: ☉SELECT ☉语句用法: ◆SELECT * FROM tbl_name; 查询一个指定表的所有行(生产环境中一定不可用);
In this section, we will be discussing types of SQL commands. SQL Commands are divided into five broad categories – DDL, DML, DCL, TCL, and DQL. Each category is further explained below: 1. Data Definition Language(DDL): The Data Definition Language is made up of SQL commands that can...
It is the language used in database systems such as PostgreSQL, MySQL, Microsoft SQL Server, and Oracle Database. Each of these systems have their own implementations of the dozens of commands in the SQL language (i.e. their own dialects), which can be overwhelming at first. SQL can do...