sql-server - SQL 从多个表中随机选择并在一个表上按特定条件排序

Question

我需要从 3 个表中选择一个随机记录并确保我是通过 photoOrder 订购的

Select TOP 1(a.id), a.mls_number, a.parcel_name, a.property_type, a.ownership_type,     b.filename, b.photoOrder, c.county_Name
From property as a
Inner JOIN
listingPhotos as b on a.id = b.ListingID 
LEFT JOIN
counties as C on a.county_name = c.id
WHERE a.isCommercial = 'True'
Order By NEWID()

所以这个查询有效，但我需要确保 b.filename 记录按 b.photoOrder 排序，因此 b.photoOrder 应该始终为 1。 b 表（列出照片）每个属性有多个照片文件，我需要仅选择照片顺序中排名第一的照片。

谢谢

Answer 1

您可以子查询您的 listingPhotos 表并限制为 WHERE PhotoOrder = 1：

Select TOP 1(a.id), a.mls_number, a.parcel_name, a.property_type, a.ownership_type,     b.filename, b.photoOrder, c.county_Name
From property as a
Inner JOIN
(SELECT ListingID , filename, PhotoOrder FROM listingPhotos WHERE PhotoORder = 1
       ) as b on a.id = b.ListingID 
LEFT JOIN
counties as C on a.county_name = c.id
WHERE a.isCommercial = 'True'
Order By NEWID()