Question

rowid |zipcode  | pid
------|---------|---------------------
1     |14586    | aaaaa
2     |14586    | aaaaa
3     |99001    | bbbbb
4     |99002    | bbbbb
5     |99002    | bbbbb
6     |10006    | ccccc
7     |10007    | ccccc
8     |10008    | ddddd
9     |10009    | eeeee

我想找到pid多次出现的行，而zipcode只出现一次。例如，我希望查询结果为：

rowid |zipcode  | pid
------|---------|---------------------
3     |99001    | bbbbb
6     |10006    | ccccc
7     |10007    | ccccc

mysql查询语句应该是什么样的？

提前致谢！

Answer 1

你需要在这里结合一些东西。首先，您需要所有带有计数1的邮政编码，而不是所有带计数的pid＆gt;他们需要在同一行。

SELECT * FROM 
(SELECT MIN(row_id) as use_row, zipcode, count(zipcode) as zip_count
FROM table
GROUP BY zipcode
HAVING zip_count = 1) as a
JOIN 
( SELECT MIN(row_id) as use_row, pid, count(pid) as pid_count
  FROM table
  GROUP BY pid
  HAVING pid_count > 1) as b 
  ON b.use_row=a.use_row

希望与MIN（）的行匹配有效。

Answer 2

最后找出了一个基于Seb答案的工作查询

SELECT * FROM 
            (SELECT rowid,zipcode,pid
            FROM table
            GROUP BY pid,zipcode
            HAVING count(*) = 1) as a
JOIN (
SELECT rowid FROM table 
    where pid IN (
    Select * from (
        SELECT pid
        FROM table 
        GROUP BY pid
        HAVING COUNT(*) >1
    ) as b)) as c
ON a.rowid = c.rowid

Mysql查询：查找一列中包含相同数据的行，而另一列包含仅出现一次的数据

2 个答案: