删除重复数据，不保留

标签：src   数据   arc   drop   val   select   dynamic   ima   code   

-- 建表

DROP TABLE IF EXISTS `table1`;
CREATE TABLE `table1` (
`id` int(11) NULL DEFAULT NULL,
`name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NULL DEFAULT NULL
) ENGINE = InnoDB CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = Dynamic;

INSERT INTO `table1` VALUES (2, ‘B‘);
INSERT INTO `table1` VALUES (3, ‘C‘);
INSERT INTO `table1` VALUES (4, ‘D‘);
INSERT INTO `table1` VALUES (5, ‘E‘);
INSERT INTO `table1` VALUES (1, ‘A‘);
INSERT INTO `table1` VALUES (1, ‘A‘);

-- 查询

 --删除，结果

delete from table1 where name in (
SELECT * from (
SELECT name from table1 GROUP BY name having COUNT(id)>1)a
)

删除重复数据，不保留

标签：src   数据   arc   drop   val   select   dynamic   ima   code   

原文地址：https://www.cnblogs.com/liyunchuan/p/12594146.html