Question

我有5张桌子：

文件
标签
join_File_Tags
配置文件
join_Profile_Tags

“个人档案”和“join_Profile_Tags”表确定用户可以看到的文件。

数据可能如下所示：

File1 包含一个，三个
File2 包含标签一个，五个
File3 包含一个，三个，六个
Profile1 可以访问标签两个，三个，四个
Profile2 可以访问标签一个，两个，三个，四个，五

我需要一个查询，返回与Profile的标签列表中的所有标签匹配的文件。

我想出了这个：

SELECT 
    files.id,
    files.FileName,
    (SELECT COUNT(j_file_tags.id) from j_file_tags  WHERE j_file_tags.fileID = files.id ) as fileTagCount
FROM files
LEFT JOIN j_file_tags ON j_file_tags.fileID = files.id
LEFT JOIN tags ON tags.id = j_file_tags.tagID
WHERE
    files.caseID = '123456'
    AND 
    j_file_tags.tagID IN ("One, Two, Three, Four, Five") /* i can get these before hand */
GROUP BY 
    files.id
HAVING 
    COUNT(j_file_tags.id) = fileTagCount /* this makes sure that the user has access to ALL the tags applied to the file*/

这正是我所需要的。但我现在想要的是：每个标签中有多少个文件？

因此，在顶部的示例数据中， Profile2 用户将看到 File1 和 File2 ，但 File3 >因为那个标签六，哪个profile2无权访问。我需要一个构建标签云的查询（没有基于j_profile_tags表的biggie），但我需要标签包含文件计数。我需要标记一个来显示数字2，三个显示1，五个显示1.我到目前为止尝试的查询包括所有的计数文件，因此即使 Profile2 无法访问该第三个文件，标记一个也会计入3。这是我的半工作查询：

SELECT
    tags.id,
    tags.TagName,
    COUNT(tags.id) as tagCount
FROM
    tags
INNER JOIN j_file_tags ON tags.id = j_file_tags.tagID
INNER JOIN files ON j_file_tags.fileID = files.id
INNER JOIN j_profile_tags ON j_profile_tags.tagID = tags.id AND j_profile_tags.profileID = 'Profile2'
WHERE
    files.caseID = '123456'
GROUP BY
    tags.id

Answer 1

我不完全了解您的表格，尤其是 “员工” 列。但是，如果您的意思是 每个标记中包含的文件 过滤了多少个文件，那么请尝试以下查询：

DECLARE @TblFiles AS TABLE(ID int identity(1, 1) primary key, TheFileName varchar(50))
DECLARE @TblTags AS TABLE(ID int identity(1, 1) primary key, TheTag varchar(50))
DECLARE @TblProfiles AS TABLE(ID int identity(1, 1) primary key, TheProfile varchar(50))

DECLARE @TblFileTagMapper AS TABLE(ID int identity(1, 1) primary key, FileID int, TagID int)
DECLARE @TblProfileTagMapper AS TABLE(ID int identity(1, 1) primary key, ProfileID int, TagID int)

INSERT INTO @TblFiles(TheFileName) VALUES ('File1'), ('File2'), ('File3')
INSERT INTO @TblTags(TheTag) VALUES ('One'), ('Two'), ('Three'), ('Four'), ('Five'), ('Six')
INSERT INTO @TblProfiles(TheProfile) VALUES ('Profile1'), ('Profile2')
INSERT INTO @TblFileTagMapper(FileID, TagID) VALUES (1,1), (1,3), (2,1), (2,5), (3,1), (3,3), (3,6)
INSERT INTO @TblProfileTagMapper(ProfileID, TagID) VALUES (1,2), (1,3), (1,4), (2,1), (2,2), (2,3), (2,4), (2,5)

--Display File-Tag
SELECT  TheFileName
       ,STUFF((SELECT ', ' + CAST(TheTag AS VARCHAR(10)) [text()]
         FROM (SELECT F.TheFileName, T.TheTag FROM @TblFileTagMapper FT INNER JOIN @TblFiles F ON FT.FileID = F.ID INNER JOIN @TblTags T ON FT.TagID = T.ID) FT 
         WHERE TheFileName = t.TheFileName
         FOR XML PATH(''), TYPE)
        .value('.','NVARCHAR(MAX)'),1,2,' ') Tags
FROM (SELECT F.TheFileName, T.TheTag FROM @TblFileTagMapper FT INNER JOIN @TblFiles F ON FT.FileID = F.ID INNER JOIN @TblTags T ON FT.TagID = T.ID) t
GROUP BY TheFileName

--Display Profile-Tag
SELECT  TheProfile
       ,STUFF((SELECT ', ' + CAST(TheTag AS VARCHAR(10)) [text()]
         FROM (SELECT P.TheProfile, T.TheTag FROM @TblProfileTagMapper PT INNER JOIN @TblProfiles P ON PT.ProfileID = P.ID INNER JOIN @TblTags T ON PT.TagID = T.ID) PT
         WHERE TheProfile = t.TheProfile
         FOR XML PATH(''), TYPE)
        .value('.','NVARCHAR(MAX)'),1,2,' ') Tags
FROM (SELECT P.TheProfile, T.TheTag FROM @TblProfileTagMapper PT INNER JOIN @TblProfiles P ON PT.ProfileID = P.ID INNER JOIN @TblTags T ON PT.TagID = T.ID) t
GROUP BY TheProfile

--> Param Input
DECLARE @ParamProfile VARCHAR(50) = 'Profile2'

--> The Solution Query
SELECT T.TheTag, COALESCE(X.FileCount, 0) AS NumberOfFilesWhichContainTheTag
FROM @TblTags T
LEFT JOIN(
    SELECT FT.TagID, COUNT(FT.FileID) AS FileCount
    FROM @TblFileTagMapper FT
    WHERE EXISTS(SELECT 1 FROM @TblProfileTagMapper PT INNER JOIN @TblProfiles P ON PT.ProfileID = P.ID WHERE PT.TagID = FT.TagID AND P.TheProfile = @ParamProfile)
    GROUP BY FT.TagID

) X ON T.ID = X.TagID

这些可能不是您问题的真正答案，但可能会帮助您实现目标。

如何编写查询以计算具有多个约束和匹配的记录？

1 个答案: