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-- SELECT user, host FROM mysql.user; SHOW DATABASES; SHOW PROCESSLIST; SHOW GRANTS; -- echo "CREATE USER "${domain}"@"localhost" IDENTIFIED BY \"${dbup}\";" | mysql -u root -p"${dbrp}" -- echo "CREATE DATABASE ${domain};" | mysql -u root -p"${dbrp}" -- echo "GRANT ALL PRIVILEGES ON ${domain}.* TO ${domain}@localhost;" | mysql -u root -p"${dbrp}" -- CREATE USER domain @ localhost IDENTIFIED BY dbup; | mysql -u root -p dbrp -- CREATE DATABASE domain; | mysql -u root -p dbrp -- GRANT ALL PRIVILEGES ON domain.* TO domain @localhost; | mysql -u root -p dbrp -- SELECT * FROM information_schema.processlist; -- SELECT ID , user, host, db, command -- FROM information_schema.processlist -- WHERE ID = CONNECTION_ID(); -- CREATE USER IF NOT EXISTS 'emp_read_only'@'localhost' IDENTIFIED BY 'TestPassword'; -- SELECT * FROM mysql.user; -- SELECT user(); -- SELECT current_user(); -- SELECT DATABASE(); DROP TABLE IF EXISTS `student1`; -- CREATE TABLE table_name -- ( -- column_name1 data_type(size), -- column_name2 data_type(size), -- column_name3 data_type(size), -- ); CREATE TABLE `student1` ( `id` int(10) NOT NULL AUTO_INCREMENT, `name` varchar(15) DEFAULT NULL, `sex` char(4) DEFAULT NULL, `address` varchar(20) DEFAULT NULL, `hobby` varchar(30) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=19 DEFAULT CHARSET=utf8; -- insert into `student1`(`id`,`name`,`sex`,`address`,`hobby`) values (1,'张飞','男','河南省','游泳'),(6,'大乔','女','新疆省','游泳'),(10,'周瑜','男','陕西','游泳'),(16,'曹操','女','巴西','游泳'),(17,'张三','女','陕西','篮球'); DROP TABLE IF EXISTS `student2`; CREATE TABLE `student2` ( `id` int(10) NOT NULL AUTO_INCREMENT, `name` varchar(15) DEFAULT NULL, `sex` char(4) DEFAULT NULL, `address` varchar(20) DEFAULT NULL, `hobby` varchar(30) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=19 DEFAULT CHARSET=utf8; CREATE TEMPORARY TABLE student3 ( `id` int(10) NOT NULL AUTO_INCREMENT, `name` varchar(15) DEFAULT NULL, `sex` char(4) DEFAULT NULL, `address` varchar(20) DEFAULT NULL, `hobby` varchar(30) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=19 DEFAULT CHARSET=utf8; DESC student1; -- SHOW DATABASES; SHOW TABLES; -- use information_schema; -- SHOW TABLES; -- use sakila; -- SHOW TABLES; -- SELECT DATABASE(); /* -- 创建临时表 CREATE TEMPORARY TABLE temp_orders AS SELECT * FROM orders WHERE order_date >= '2023-01-01'; -- 查询临时表 SELECT * FROM temp_orders; -- 插入数据到临时表 INSERT INTO temp_orders (order_id, customer_id, order_date) VALUES (1001, 1, '2023-01-05'); -- 查询临时表 SELECT * FROM temp_orders; -- 删除临时表 DROP TEMPORARY TABLE IF EXISTS temp_orders; */