Question

我将以下查询作为存储过程的一部分。它返回一些国家的指标以及我们在每个国家/地区的位置。此查询工作正常。

但是，这将返回所有国家/地区的数据，包括我们没有位置的国家/地区。我想修改它，以便它只返回CenterCount＆gt;的记录。 0，但CenterCount只是子查询结果的别名，所以我不能只放WHERE CenterCount > 0。

我知道我可以通过在WHERE或HAVING子句中复制子查询来做到这一点，但我不想在那里有两次子查询。有没有更好的方法呢？

  SELECT 
    cn.Code as CountryCode,
    cn.CountryName,
    ( 
      SELECT COUNT(DISTINCT(CenterID))
      FROM Center.Center center
      JOIN Organization.OrganizationAddress orgAddr
      ON center.OrganizationID = orgAddr.OrganizationID
      JOIN Common.Address ca
      ON orgAddr.AddressID = ca.AddressID
      AND ca.AddressTypeID = 1 --Physical
      WHERE ca.CountryID = cn.CountryID
      AND center.ActiveInd = 1 
      AND ( (center.CenterStatusTypeID = 1) OR (center.CenterStatusTypeID = 2 AND center.OpenUTCDate <= DATEADD(DAY, 14, GETUTCDATE())) )
      AND ca.ActiveInd = 1
    ) as CenterCount,
    (
      SELECT COUNT(DISTINCT(SatelliteID))
      FROM Center.Satellite sat
      JOIN Common.Address ca
      ON sat.AddressID = ca.AddressID
      WHERE ca.CountryID = cn.CountryID
      AND sat.ActiveInd = 1
      AND sat.StatusTypeID = 2 --Approved
      AND sat.PayerTypeID = 2 --Retail
      AND sat.WebsitePresenceFlag = 1
      AND sat.OpenUTCDate <= DATEADD(DAY, 14, GETUTCDATE())      
    ) as SatelliteCount
  FROM Core.Country cn
  WHERE (@Country IS NULL OR cn.CountryID = @CountryID)
  ORDER BY 1

Answer 1

一种简单的方法就是将原始查询转换为公用表表达式，这样就可以让您按照自己的意愿使用WHERE CenterCount > 0。

  ;WITH cte AS
  (
  SELECT 
    cn.Code as CountryCode,
    cn.CountryName,
    ( 
      SELECT COUNT(DISTINCT(CenterID))
      FROM Center.Center center
      JOIN Organization.OrganizationAddress orgAddr
      ON center.OrganizationID = orgAddr.OrganizationID
      JOIN Common.Address ca
      ON orgAddr.AddressID = ca.AddressID
      AND ca.AddressTypeID = 1 --Physical
      WHERE ca.CountryID = cn.CountryID
      AND center.ActiveInd = 1 
      AND ( (center.CenterStatusTypeID = 1) OR (center.CenterStatusTypeID = 2 AND center.OpenUTCDate <= DATEADD(DAY, 14, GETUTCDATE())) )
      AND ca.ActiveInd = 1
    ) as CenterCount,
    (
      SELECT COUNT(DISTINCT(SatelliteID))
      FROM Center.Satellite sat
      JOIN Common.Address ca
      ON sat.AddressID = ca.AddressID
      WHERE ca.CountryID = cn.CountryID
      AND sat.ActiveInd = 1
      AND sat.StatusTypeID = 2 --Approved
      AND sat.PayerTypeID = 2 --Retail
      AND sat.WebsitePresenceFlag = 1
      AND sat.OpenUTCDate <= DATEADD(DAY, 14, GETUTCDATE())      
    ) as SatelliteCount
  FROM Core.Country cn
  WHERE (@Country IS NULL OR cn.CountryID = @CountryID)
  )
  SELECT *
  FROM cte
  WHERE CenterCount > 0
  ORDER BY 1

根据子查询的结果筛选查询

1 个答案: