时间:2021-07-01 10:21:17 帮助过:3人阅读
id, p_id, p_name , p_content , p_time
1 343 aaa aaaaaa 2012-09-01
2 344 bbb bbbbbb 2012-09-02
3 321 ccc cccccccc 2012-09-03
4 343 aaa aaaaaa 2012-09-04
想查询不重复的行的内容,并且输出 p_sum ( 产品p_id出现重复的次数)
select *, count(*) as p_sum from p_table_name group by p_name;
查询不重复的行的总行数(好写翻页)
select count(distinct p_id) as num from p_table_name;
mysql查询非重复的行内容,不重复的记录数count(distinct xx)
标签:group -- distinct sql查询 aaaaa 重复 ble table 去重