2

使用 SQL Server 2008。

大家好，我有一张桌子，Language我需要这张桌子是LanguageID（1-10）。
我有另一张桌子UserQuiz，我需要ModuleID通过COUNT()。
该计划是展示 10 种语言和 4 个模块，用户通过计数。

所以它将是 40 条记录（LanguageIDs * ModuleIDs）。
但并非所有语言都有所有模块，因此没有任何记录。

我需要一个查询，它只填写缺少的模块并将 null 放入用户计数的记录中。

到目前为止，我已经尝试...

更新:: 29/08/2013 @ 10:35 am (GMT)。

CREATE TABLE #CrossTable(
LanguageID int,
ModuleID int
)
INSERT INTO #CrossTable
SELECT LanguageID, ModuleID 
FROM 
RoundupAcademy.dbo.Languages
CROSS JOIN
RoundupAcademy.dbo.CurrentModules
/*********************************************************************************/

/** get users via date and quiz **************************************************/
CREATE TABLE #userspassed(
userid int,
passed int,
moduleid int,
languageid int
)
INSERT INTO #userspassed
SELECT userprofile.UserId, passed, userquiz.moduleID, LanguageId
FROM 
UserProfile
LEFT JOIN 
UserQuiz
ON
UserProfile.UserId = UserQuiz.userID
WHERE
((Convert(datetime,LastLogin, 120) >= 
    Convert(datetime,@datefrom, 120) 
AND (Convert(datetime,LastLogin, 120) <= 
        convert(datetime,@datetoo, 120))))
AND
(passed is null or passed = 1)
/*********************************************************************************/

/**Get Modules per language count on users passed ********************************/
SELECT 
#CrossTable.languageID, 
#CrossTable.ModuleID,
coalesce(COUNT(#userspassed.userID),0) as users 
FROM 
#CrossTable
LEFT JOIN
#userspassed
ON 
#CrossTable.ModuleID = #userspassed.moduleID
GROUP BY #CrossTable.LanguageID, #CrossTable.ModuleID

/*********************************************************************************/

this does bring back 40 records but module "n" that is repeated 10 times for language also has repeated Users(count). seems there is only 4 values that is being applied to 10 of the languages for module 1 (value 94) and 10 for module 2 (value 89) and 10 for module 3 (value 104) and 10 for module 4 (value 28).

Each record should be different but it seems its applying the same values to all modules that are the same.

UPDATED:: 29/08/2013 @ 11:05 am (GMT).

I forgot to add

AND 
#CrossTable.LanguageID = #userspassed.languageid

seems to work now just going to check the values are correct

4

1 回答 1

2

Maybe link to the language on the JOIN as well. Also you shouldn't need a COALESCE on a COUNT:

SELECT 
    #CrossTable.languageID, 
    #CrossTable.ModuleID,
    COUNT(#userspassed.userID) as users 
FROM 
    #CrossTable
LEFT JOIN
    #userspassed ON 
      #CrossTable.LanguageID = #userspassed.languageid
      AND #CrossTable.ModuleeID = #userspassed.moduleid
GROUP BY #CrossTable.LanguageID, #CrossTable.ModuleID
于 2013-08-29T10:04:09.297 回答