SQL Server : SUM() of multiple rows including wher

问题:

I have a table that looks something like the following :

  PropertyID     Amount     Type       EndDate
 --------------------------------------------
   1              100       RENT        null              
   1              50        WATER       null         
   1              60        ELEC        null        
   1              10        OTHER       null      
   2              70        RENT        null
   2              10        WATER       null

There will be multiple items billed to a property, also billed multiple times. For example RENT could be billed to property #1 12 times (over a year), however the only ones I'm interested for are those with ENDDATE of null (in otherwords, current)

I would like to achieve :

    PropertyId       Amount
  --------------------------       
      1                220
      2                80

I have tried to do something like this :

SELECT
   propertyId,
   SUM() as TOTAL_COSTS
FROM
   MyTable

However, in the SUM would I be forced to have multiple selects bringing back the current amount for each type of charge? I could see this becoming messy and I'm hoping for a much simpler solution

Any ideas?

回答1:

This will bring back totals per property and type

SELECT  PropertyID,
        TYPE,
        SUM(Amount)
FROM    yourTable
GROUP BY    PropertyID,
            TYPE

This will bring back only active values

SELECT  PropertyID,
        TYPE,
        SUM(Amount)
FROM    yourTable
WHERE   EndDate IS NULL
GROUP BY    PropertyID,
            TYPE

and this will bring back totals for properties

SELECT  PropertyID,
        SUM(Amount)
FROM    yourTable
WHERE   EndDate IS NULL
GROUP BY    PropertyID

......

回答2:

Try this:

SELECT
   PropertyId,
   SUM(Amount) as TOTAL_COSTS
FROM
   MyTable
WHERE
   EndDate IS NULL
GROUP BY
   PropertyId

回答3:

you mean getiing sum(Amount of all types) for each property where EndDate is null:

SELECT propertyId, SUM(Amount) as TOTAL_COSTS
  FROM MyTable
 WHERE EndDate IS NULL
GROUP BY propertyId

回答4:

sounds like you want something like:

select PropertyID, SUM(Amount)
from MyTable
Where EndDate is null
Group by PropertyID

回答5:

The WHERE clause is always conceptually applied (the execution plan can do what it wants, obviously) prior to the GROUP BY. It must come before the GROUP BY in the query, and acts as a filter before things are SUMmed, which is how most of the answers here work.

You should also be aware of the optional HAVING clause which must come after the GROUP BY. This can be used to filter on the resulting properties of groups after GROUPing - for instance HAVING SUM(Amount) > 0

回答6:

Use a common table expression to add grand total row, top 100 is required for order by to work.

With Detail as 
(
    SELECT  top 100 propertyId, SUM(Amount) as TOTAL_COSTS
    FROM MyTable
    WHERE EndDate IS NULL
    GROUP BY propertyId
    ORDER BY TOTAL_COSTS desc
)

Select * from Detail
Union all
Select ' Total ', sum(TOTAL_COSTS) from Detail