4.创建一个可以从任何地方连接服务器的一个完全的超级用户,但是必须使用一个口令something做这个 GRANT ALL PRIVILEGES ON *.* TO monty@localhost IDENTIFIED BY 'something' WITH GRANT OPTION; GRANT ALL PRIVILEGES ON *.* TO monty@"%" IDENTIFIED BY 'something' WITH GRANT OPTION;
5.删除授权: REVOKE ALL PRIVILEGES ON *.* FROM root@"%"; USE mysql; DELETE FROM user WHERE User="root" and Host="%"; FLUSH PRIVILEGES;
6. 创建一个用户custom在特定客户端weiqiong.com登录,可访问特定数据库bankaccount mysql> GRANT SELECT,INSERT,UPDATE,DELETE,CREATE,DROP ON bankaccount.* TO custom@weiqiong.com IDENTIFIED BY 'stupid';
7.重命名表: ALTER TABLE t1 RENAME t2;
为了改变列a,从INTEGER改为TINYINT NOT NULL(名字一样), 并且改变列b,从CHAR(10)改为CHAR(20),同时重命名它,从b改为c: ALTER TABLE t2 MODIFY a TINYINT NOT NULL, CHANGE b c CHAR(20);
增加一个新TIMESTAMP列,名为d: ALTER TABLE t2 ADD d TIMESTAMP;
在列d上增加一个索引,并且使列a为主键: ALTER TABLE t2 ADD INDEX (d), ADD PRIMARY KEY (a);
删除列c: ALTER TABLE t2 DROP COLUMN c;
增加一个新的AUTO_INCREMENT整数列,命名为c: ALTER TABLE t2 ADD c INT UNSIGNED NOT NULL AUTO_INCREMENT,ADD INDEX (c); 注意,我们索引了c,因为AUTO_INCREMENT柱必须被索引,并且另外我们声明c为NOT NULL, 因为索引了的列不能是NULL。
8.删除记录: DELETE FROM t1 WHERE C>10;
6.改变某几行: UPDATE t1 SET user=weiqiong,password=weiqiong;
7.使用name列的头10个字符创建一个索引: CREATE INDEX part_of_name ON customer (name(10));