【mysql】Mysql公用表表达式with as

Mysql公用表表达式

mysql在8.0开始支持with的写法

SELECT VERSION() ;

-- kwan.t_employee definition

CREATE TABLE `t_employee` (
  `name` varchar(16) NOT NULL,
  `income` int NOT NULL,
  PRIMARY KEY (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

INSERT INTO kwan.t_employee (name, income) VALUES('劳伦斯', 15000);
INSERT INTO kwan.t_employee (name, income) VALUES('史密斯', 20000);
INSERT INTO kwan.t_employee (name, income) VALUES('哈德逊', 15000);
INSERT INTO kwan.t_employee (name, income) VALUES('怀特', 20000);
INSERT INTO kwan.t_employee (name, income) VALUES('斯科特', 10000);
INSERT INTO kwan.t_employee (name, income) VALUES('桑普森', 400000);
INSERT INTO kwan.t_employee (name, income) VALUES('肯特', 10000);
INSERT INTO kwan.t_employee (name, income) VALUES('贝克', 10000);
INSERT INTO kwan.t_employee (name, income) VALUES('迈克', 30000);
INSERT INTO kwan.t_employee (name, income) VALUES('阿诺德', 20000);

with  tmp as(
      SELECT * from kwan.t_employee
)
SELECT  * from tmp;