sql - 条件查询

Question

我正在显示下表中的属性。现在我要做的是，在相同的位置找到特性(假设我的特性位于 sec-19，匹配 sec-19，如果没有找到，则搜索整个城市)，条件如下它应该在 10 天前发布，或者如果没有在 10 天前发布，则根据 30 天前的结果。

我有下面提到的下表(属性):

现在我要从此表中检索的是上市时间少于 10 天的那些特性的 'Propertyid' 和 'Average Price' 如果没有一个少于 10 天则返回少于 30 天的结果天。

谁能帮我解决这个问题。提前致谢。

或者只是 Any body can answer me without the Location match.

我需要根据 10 天前发布的属性计算“平均价格”，如果 10 天前没有发布属性，则将其视为 30 天前。像这样:

Select AVG(Price) As Average_Price from Properties where (DATEDIFF(day,listingtime,getdate())<30 or DATEDIFF(day,listingtime,getdate())<10)

但这里我只得到一个字段“平均价格”，而且我也没有检查以过滤它是 10 天前还是 30 天前发布的。 Knidly 重新检查并尝试解决我的问题。提前致谢。

Answer 1

我在这方面花了一些时间，我相信我已经解决了您的所有疑虑。我不完全确定城市或位置的数据类型，所以我使用了 varchar(100) 这应该可以解决您的所有问题。如果存在您描述的无法解决的情况，请发表评论。

   CREATE PROCEDURE [dbo].[GetRecentlyListedProperties]
(@location varchar(100), @city varchar(100),@propertyID int)
As
Begin
DECLARE @numberOfDays int,
        @propertyCount int, 
        @IsLocation bit -- looking for a location and not a city    
SET @Propertycount = 0
SET @numberOfDays= 10 
-- CHECK TO SEE IF THERE ARE LISTINGS IN THE LAST 10 DAYS IN THE SAME LOCATION
SELECT  @PropertyCount = 
 Count(*) FROM properties where location = @location and DATEDIFF(day,listingtime,GETDATE()) < @numberOFDays
 and PropertyID != @propertyID
If(@PropertyCount = 0)
Begin
-- CHECK TO SEE IF THERE ARE LISTINGS IN THE LAST 10 DAYS IN THE SAME CITY
SELECT  @PropertyCount = Count(*) from properties where city = @city 
        AND DATEDIFF(day,listingtime,GETDATE()) < @numberOFDays
        AND PropertyID != @propertyID   
    IF(@PropertyCount = 0 )
    BEGIN
    SET @NumberOfDays = 30
    -- CHECK TO SEE IF THERE ARE LISTINGS IN THE LAST 30 DAYS IN THE SAME LOCATION
    SELECT  @PropertyCount = COUNT(*) from properties where location = @location 
            AND DATEDIFF(day,listingtime,GETDATE()) < @numberOFDays
            AND PropertyID != @propertyID
        IF(@PropertyCount = 0 )
        BEGIN
        -- CHECK TO SEE IF THERE ARE LISTINGS IN THE LAST 30 DAYS IN THE SAME CITY
        SELECT @PropertyCount = Count(*) from properties where city = @city 
                AND DATEDIFF(day,listingtime,GETDATE()) < @numberOFDays
                AND PropertyID != @propertyID
        END
        ELSE
        SET @IsLocation = 1 --There are properties in the same location in the last 30 days
    END
    ELSE
    SET @IsLocation  = 0 -- There are properties listed int he city in the last 10 days
End
Else
SET @IsLocation = 1
-- This is where the appropriate results are returned. 
IF(@IsLocation = 1)
Begin
SELECT * ,(SELECT AVG(PRICE) as AveragePrice
       FROM PROPERTIES 
       WHERE DATEDIFF(day,listingtime,GETDATE()) < @numberOFDays
         AND Location = @Location
         AND PropertyID != @propertyID)
FROM Properties 
WHERE DATEDIFF(day,listingtime,GETDATE()) < @numberOFDays
      AND Location = @Location
      AND PropertyID != @propertyID
End
ElSE
SELECT * ,(SELECT AVG(PRICE) as AveragePrice
      FROM PROPERTIES 
          WHERE DATEDIFF(day,listingtime,GETDATE()) < @numberOFDays
          AND City = @City
          AND PropertyID != @propertyID)
FROM Properties 
WHERE DATEDIFF(day,listingtime,GETDATE()) < @numberOFDays
      AND City = @City 
      AND PropertyID != @propertyID
End

您可能需要更改位置和城市外键的某些数据类型，因为我将它们用作 varchars。