数据库表中数据项有重复,需要删除其中多余的记录,保留一条记录即可,除了主键ID不同外,所有其他字段值都相同。
如下图所示:
一、查询数据表中某列数值重复的记录
查询wage_result表中agent_code字段值相同的记录
SELECT
id as ‘主键ID’,
agent_code,
COUNT(*) AS num — 重复数
FROM
wage_result
WHERE
index_calno = '202204'
AND del_flag = '0'
GROUP BY
agent_code
HAVING
num > 1;
二、删除重复项
Copy id 这一列,拼装为:‘1526767272776182098’,‘1526767272776182097’,‘1526767272776182101’
然后 DELETE 即可
DELETE FROM wage_result WHERE id IN
(
'1526767272776182048','1526767272776182047','1526767272776182046','1526767272776182045','1526767272776182044','1526767272776182043','1526767272776182042','1526767272776182041','1526767272776182040','1526767272776182039''
);