mysql基础操作

/**建表*/
DROP TABLE IF EXISTS usersTable;
CREATE TABLE usersTable (
  ID          BIGINT(20)     UNSIGNED   NOT NULL           AUTO_INCREMENT,
  NAME        VARCHAR(255)   NOT NULL   DEFAULT 'myName',  COMMENT '名称',
  AGE         INT(3)                    DEFAULT '0',  COMMENT '名称',
  SEX         tinyint(1)                DEFAULT '1',  COMMENT '男(1)，女(0)',
  BIRTHDAY    datetime,
  PRIMARY KEY (ID)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
CREATE INDEX INDEX_NAME_BIRTHDAY  ON usersTable(NAME, BIRTHDAY);

/**表字段修改*/
ALTER TABLE usersTable ADD COLUMN ip varchar(15) DEFAULT '127.0.0.1' COMMENT '登录IP' AFTER ID;  
ALTER TABLE usersTable CHANGE COLUMN ip reg_ip varchar(15) DEFAULT 'localhost';
ALTER TABLE usersTable DROP COLUMN reg_ip;

/**数据修改*/
INSERT INTO usersTable(username, pass, email) VALUES('user1', '123', '[email protected]');
UPDATE usersTable set pass='123456', email='[email protected]' WHERE username='user1';
DELETE FROM usersTable WHERE username='user1';
update usersTable set title =  replace(title,'oldWord','newWord') where title like '%oldWord%';

/**清空数据*/
TRUNCATE TABLE usersTable;

/**查看表结构**/
describe usersTable;

/**查看数据库大小*/
use information_schema;
select concat(round(sum(DATA_LENGTH/1024/1024),2),'MB') as data  from TABLES where table_schema='usersTable';