第2条：不同的限制

Question

I have a table of data, and I wanted to make a WHERE clause with 2 different restrictions applying to the same variable. I cannot figure out a way to apply it though.

This is my current table (MINUS THE SUMMARY COLUMN THAT IS MY GOAL)

 ID    Location    Price     PriceDescription     SummedCost     Summary
 1     Park        -10       Cost.Water           -18            -7
 1     Park        -8        Cost.Gas
 1     Park        11        Sold.Price
 2     Tom         20        Sold.Price           -6             14
 2     Tom         -6        Cost.Soap
 3     Matt        -15       Cost.Tools           -30            -9
 3     Matt        -15       Cost.Gas
 3     Matt        21        Sold.Price
 4     College     32        Sold.Price           -22            21
 4     College     -22       Cost.Water
 4     College     11        Sold.LateFee

My code is

SELECT ID 
    ,Location
    ,Price
    ,PriceDescription
    ,SUM(Price) over(Partition by Location) AS SummedCost
FROM 
    table
WHERE 
    PriceDescription LIKE 'Cost.%'

And this is where I run into problems. I would like to have the summary column which sums all of the prices, but I do not know how to write a WHERE statement that says the PriceDescription LIKE 'Cost.%' for the SummedCost column and PriceDescription LIKE '%.%' for the Summary column.

Is this possible? I tried to add the WHERE PriceDescription LIKE '%.%' to SUM(Price) over(Partition by Location) AS SummedCost but I got an Error Regarding the 'as'.

Thanks for any help!

Answer 1

Remove the WHERE clause, and use a CASE expression in the SUM() :

SELECT ID 
       ,Location
       ,Price
       ,PriceDescription
       ,SUM(Case When PriceDescription Like 'Cost.%' 
                 Then Price 
                 Else 0 
            End) Over(Partition by Location) AS SummedCost
       ,SUM(Price) Over(Partition by Location) As Summary
FROM table

Answer 2

您可以在以下情况下使用案例：

,SUM(case when PriceDescription like 'Cost.%' then Price else 0 end) over(Partition by Location) AS SummedCost