Question

考虑我们有一个带有此列的表 ID fk_newsId fk_NewsGroupId fk_NewsZoneId

我需要选择所有具有相同fk_NewsGroup和fk_NewsZone的记录像这样

+----+-----------+--------------+-------------+
| Id | fk_NewsId | fk_NewsGroup | fk_NewsZone |
+----+-----------+--------------+-------------+
|  1 |        60 |            5 |           8 |
|  2 |        30 |            5 |           8 |
|  3 |        31 |            9 |          20 |
|  4 |         5 |            9 |          20 |
|  5 |        12 |            9 |          20 |
|  6 |      1000 |           20 |          11 |
|  7 |        21 |           20 |          11 |
|  8 |         6 |           20 |          11 |
+----+-----------+--------------+-------------+

该怎么做？我像这样分组但是它并没有给出期望的输出

select fk_NewsId, fk_NewsGroup,fk_NewsZone  from tbl_test
group by fk_NewsGroup,fk_NewsZone,fk_NewsId

Answer 1

您可以尝试将COUNT与窗口功能一起使用，以通过count和fk_NewsGroup列获取fk_NewsZone。

然后获得大于一的计数。

SELECT * 
FROM (
    SELECT *,COUNT(*) OVER(PARTITION BY fk_NewsGroup,fk_NewsZone ORDER BY fk_NewsZone) cnt
    FROM tbl_test
)t1
where t1.cnt > 1

dbfiddle

Answer 2

关于您的意思不是很清楚，但是类似：

SELECT t.Id, t.fk_NewsId, t.fk_NewsGroup, t.fk_NewsZone FROM tbl_test t
INNER JOIN (
SELECT fk_NewsGroup,fk_NewsZone, COUNT(*) AS Counted FROM tbl_test
GROUP BY fk_NewsGroup,fk_NewsZone
HAVING COUNT(*) > 1) g
ON t.fk_NewsGroup = g.fk_NewsGroup
AND t.fk_NewsZone = g.fk_NewsZone

DBFiddle example

Answer 3

我将使用Group by并执行以下操作：

select max(id) as Id, Max(fk_NewsId) as fk_NewsId, fk_NewsGroup,fk_NewsZone from #temp
group by fk_NewsGroup,fk_NewsZone

根据相等的列值选择行

3 个答案: