创建表(牛客sql108改)
DROP TABLE IF EXISTS `Products`; CREATE TABLE IF NOT EXISTS `Products` ( prod_name VARCHAR(255) NOT NULL COMMENT '产品名称' ); INSERT INTO `Products` VALUES ('a'),('b'),('c'); DROP TABLE IF EXISTS `Customers`; CREATE TABLE IF NOT EXISTS `Customers`( cust_name VARCHAR(255) NOT NULL COMMENT '客户姓名' ); INSERT INTO `Customers` VALUES ('a'),('b'),('c'),('d'),('e');
Products表
Customers表
union 去重
select * from Products union select * from Customers
union all 不去重
select * from Products union all select * from Customers标签:Customers,EXISTS,union,Products,不去,SQL,TABLE,select From: https://www.cnblogs.com/ChangeG1824/p/17826059.html