我如何对不同的行求和? [英] How do I SUM DISTINCT Rows?

问题描述

我正在处理一个需要对 DISTINCT 行求和的查询.必须有办法做到这一点......但我迷路了.

I'm struggling with a query where I need to SUM DISTINCT Rows. There has to be a way to do this... but I'm lost.

这是我得到的:

SELECT DISTINCT Zipcodes.CountyID,
us_co_est2005_allData.PopEstimate2005, 
us_co_est2005_allData.EstimatesBase2000,
users_link_territory.userID
FROM
Zipcodes Inner Join Users_link_territory ON zipcodes.CountyID = 
Users_link_territory.CountyID Inner Join
us_co_est2005_alldata ON zipcodes.FIPS = us_co_est2005_alldata.State AND zipcodes.code
= us_co_est2005_alldata.County
WHERE (users_link_territory.userid = 4)

这给了我 34 行，它们为属于 userid4 的每个县提供不同的人口数量，但是我如何获得 PopEstimate2005 和 EstimatesBase2000 的总和?

This gives me the 34 rows which provide distinct population numbers for each county belonging to userid4, but how would I get the SUM of PopEstimate2005 and EstimatesBase2000?

类似(但这不是合法查询):

Something like (but this isn't a legal query):

SELECT DISTINCT Zipcodes.CountyID,
SUM(us_co_est2005_allData.PopEstimate2005) AS Population2005, 
SUM(us_co_est2005_allData.EstimatesBase2000) AS Population2000,
users_link_territory.userID
FROM
Zipcodes Inner Join Users_link_territory ON zipcodes.CountyID = 
Users_link_territory.CountyID Inner Join
us_co_est2005_alldata ON zipcodes.FIPS = us_co_est2005_alldata.State AND zipcodes.code
= us_co_est2005_alldata.County
WHERE (users_link_territory.userid = 4)
GROUP BY users_link_territory.userid

当然，只要我将 Zipcodes.CountyID 添加到 GroupBy 的末尾，我就又回到了我的 34 行.

Of course, as soon as I add Zipcodes.CountyID to the end of the GroupBy, I'm back with my 34 rows again.

非常感谢您的帮助.

罗素舒特.....

在获得以下帮助(尤其是 Robb 的帮助)后，我能够获得我真正想要的东西 - 在单个查询中获得每个 UserID 的总体详细信息:

After getting the below help - in particular Robb's help - I was able to get what I really wanted - a total of each UserID's population details in a single query:

SELECT     SUM(POPESTIMATE2005) AS Expr1, SUM(ESTIMATESBASE2000) AS Expr2, UserID
FROM         (
    SELECT DISTINCT zipcodes.CountyID, us_co_est2005_alldata.POPESTIMATE2005, us_co_est2005_alldata.ESTIMATESBASE2000, users_link_territory.UserID
    FROM          zipcodes INNER JOIN
    users_link_territory ON zipcodes.CountyID = users_link_territory.CountyID INNER JOIN
    us_co_est2005_alldata ON zipcodes.FIPS = us_co_est2005_alldata.STATE AND zipcodes.Code = us_co_est2005_alldata.COUNTY
    ) As FOO
GROUP BY UserID

感谢所有贡献的人！

罗素舒特

推荐答案

如果你只是想要一个整体的数字试试

If you just want an overall figure for it try

select sum(PopEstimate2005), sum(EstimatesBase2000)
from(
    SELECT  Distinct
        Zipcodes.CountyID, 
        us_co_est2005_allData.PopEstimate2005, 
        us_co_est2005_allData.EstimatesBase2000, 
        users_link_territory.userID 
    FROM 
        Zipcodes Inner Join 
        Users_link_territory ON zipcodes.CountyID = Users_link_territory.CountyID Inner Join 
        us_co_est2005_alldata ON zipcodes.FIPS = us_co_est2005_alldata.State AND zipcodes.code = us_co_est2005_alldata.County 
    WHERE 
        (users_link_territory.userid = 4)
) as foo

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