mysql去重保留id最小的

百度一些去重，都不是想要的答案，就動手自己來了

CREATE TABLE users(
id VARCHAR(11),
NAME VARCHAR(11),
sex VARCHAR(5)
)

 

INSERT INTO users VALUES ('1','chen','男');
INSERT INTO users VALUES ('3','chen','男');
INSERT INTO users VALUES ('2','chen','男');
INSERT INTO users VALUES ('4','li','女');
INSERT INTO users VALUES ('1','li','女');
INSERT INTO users VALUES ('2','li','女');
INSERT INTO users VALUES ('1','zhou','男');
INSERT INTO users VALUES ('2','zhou','男');
INSERT INTO users VALUES ('3','zhou','男');

 demo數據如下：

需求：只查出name字段id最小的（去重不刪除）

 

 

首先想到的是用distinct,但是distinct只能返回一個字段，就比較尷尬了

SELECT DISTINCT(a.name)FROM (SELECT * FROM users ORDER BY id )a；

如果：

SELECT a.id,DISTINCT(a.name)FROM (SELECT * FROM users ORDER BY id )a；

 則會報錯：

錯誤代碼： 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DISTINCT(a.name)from (SELECT * FROM users ORDER BY id )a
LIMIT 0, 1000' at line 1

 

 正解：SELECT * FROM (SELECT * FROM users ORDER BY id )a GROUP BY a.name;