0

我有四个表，假设它们每个只有一个 id 作为列。

  • listings
  • feature
  • location
  • l_f_location作为带有 FK 的连接表listingId，, featureId,locationId

我尝试在l_f_location表中查询给定的一组locationIds（逻辑与匹配），结果只希望那些匹配所有的列表locationIds，例如（7 AND 9 AND 10）。

l_f_location好像

listingId featureId locationId
10        5         7
10        7         7
10        8         9
11        4         7
11        8         9
11        9         10
11        12        14

在这种情况下，目标是仅检索listingId11 个 - 匹配locationIds7、9 和 10 的集合。

我尝试了以下查询

" SELECT id, COUNT(*) as num FROM l_f_locations WHERE locationId IN ( 7, 9, 10) GROUP by listingId, locationId HAVING num = 3"

但这会在分组开始时给出错误的计数值。

类似的查询在更简单的联结表上完美运行，例如只有 l_location 与例如“ SELECT id, COUNT(*) as num FROM l_location WHERE locationId IN ( 7, 9, 10) GROUP by listingId HAVING num = 3”。

Rgds，P.

4

1 回答 1

3

我假设相同listingId并且locationId可以有多个featureIds？否则，它会容易一些。

如果是这样的话：

SELECT listingId, COUNT(*) as num 
FROM
(SELECT DISTINCT listingId, locationId
 FROM l_f_locations
 WHERE locationId IN ( 7, 9, 10)) AS sub
GROUP by listingId, HAVING num = 3
于 2013-09-25T12:21:41.637 回答