如何逗號分隔的多個行

Question

Select s.FirstName, glTitle.LookupItem Title 
    from ClientStaff cs 
    left outer join Staff s on s.Id = cs.StaffId 
    left outer join StaffTitle st on st.StaffId = s.Id 
    left outer join GeneralLookup glTitle on glTitle.Id = st.glTitleId 

它返回這些行：

正如你可以看到，第一列所有相同的行，因爲一個員工可以有多個頭銜。

如何將每個員工的所有職位合併爲逗號分隔值，以便每個員工只有一行？

Answer 1

這爲我工作：

;with mycte as 
    (select s.FirstName, glTitle.LookupItem Title 
    from ClientStaff cs 
    left outer join Staff s on s.Id = cs.StaffId 
    left outer join StaffTitle st on st.StaffId = s.Id 
    left outer join GeneralLookup glTitle on glTitle.Id = st.glTitleId 
    group by FirstName, glTitle.LookupItem) 

    SELECT Distinct FirstName, Titles = Replace(Replace((SELECT title AS [data()] FROM mycte a 

    WHERE a.FirstName = b.FirstName 

    ORDER BY a.title FOR XML PATH ),'</row>',', '),'<row>','') 

    FROM mycte b 
    ORDER BY FirstName 

Answer 2

這是在標準SQL中很難（或不可能）做的事情之一。許多供應商已經擴展了SQL來支持這樣的「彙總」;不幸的是，每個供應商的語法都不一樣。對不起，我目前沒有一個方便的例子。那麼你使用的是什麼DBMS？

Answer 3

試着這麼做：

select s.FirstName, GROUP_CONCAT(glTitle.LookupItem Title, ',') 
from ClientStaff cs 
left outer join Staff s on s.Id = cs.StaffId 
left outer join StaffTitle st on st.StaffId = s.Id 
left outer join GeneralLookup glTitle on glTitle.Id = st.glTitleId 
GROUP BY s.FirstName 

真的不能測試，所以它的難度，跟蹤和錯誤通常工作最終。我建議由一個唯一的ID分組。

我希望這有助於...

Answer 4

我通常創建SQL函數，並從我的查詢調用它們。您可以使用多種方法創建逗號分隔的值列表，請參閱http://blog.sqlauthority.com/2008/06/04/sql-server-create-a-comma-delimited-list-using-select-clause-from-table-column/,Can I Comma Delimit Multiple Rows Into One Column?。

在這種情況下，如果你創建了一個函數，你可以從你的SQL查詢中調用它。例如：

select s.FirstName, dbo.GetAllJobTitlesForStaff(s.Id) AS AllJobTitles 
from ClientStaff cs 
left outer join Staff s on s.Id = cs.StaffId 

Answer 5

您可以使用此查詢。對於這種模式下的查詢，我有通用模板。你可能需要調試，因爲我沒有你的表結構。它聚結的標題成一個列表

DECLARE @List varchar(2000), @otherList varchar(2000),@FirstName varchar(2000),@id varchar(2000) 
declare @temp table(
    firstName varchar(128), 
    title varchar(4000) 
) 

DECLARE TitleList CURSOR FAST_FORWARD FOR 
select s.FirstName, s.Id 
from ClientStaff cs 
left outer join Staff s on s.Id = cs.StaffId 
OPEN TitleList 
FETCH NEXT FROM TitleList INTO @FirstName,@id 
WHILE @@FETCH_STATUS = 0 
BEGIN 
    select @List = COALESCE(@List + ',', '') + Cast(glTitle.LookupItem As varchar(400)) 
    from StaffTitle st 
    left outer join GeneralLookup glTitle on glTitle.Id = st.glTitleId 
    where st.StaffId = id 

    insert into @temp 
    select @FirstName,@List 
    set @List = null; 
FETCH NEXT FROM TitleList INTO @FirstName,@id 
END 
CLOSE TitleList 
DEALLOCATE TitleList 

select * from @temp 

Answer 6

select 
    s.FirstName, 
    stuff((select ', '+glTitle.LookupItem 
     from StaffTitle as st 
      inner join GeneralLookup as glTitle 
      on glTitle.Id = st.glTitleId 
     where st.StaffId = s.Id 
     for xml path(''), type).value('text()[1]', 'nvarchar(max)'), 1, 2, '') as Title 
from Staff as s