0

I have a temporary table with a field called Method, thus:

DECLARE @CaseSites TABLE (
 BriefID  int,
 Method  varchar(60)
 -- other fields
)

Method will be filled from several rows in another table - CaseEventTypeList.

Running

SELECT * FROM CaseEventTypeList WHERE RefID = 1

Gives

RefID TypeID
1  2
1  3
1  6

Turning this into a single comma delimited result is fairly trivial:

DECLARE @CETList varchar(30)

SELECT @CETList = COALESCE(@CETList + ',', '') + CAST(CETL.[TypeID] AS varchar)
FROM CaseEventTypeList CETL 
WHERE CETL.RefID = 1

PRINT @CETList

Giving:

2,3,6

Now I need to expand this to take in the entire table. This is what I came up with:

UPDATE @CaseSites SET Method = COALESCE(Method + ',','') + CAST(CETL.TypeID AS VARCHAR)
 FROM CaseEvents CE
   JOIN CaseEventTypeList AS CETL ON CETL.RefID = CE.TypeListID
 WHERE BriefID = CE.CaseID

However this only fills Method with the first value from each set of values.

I looked online and found this but would rather not use a udf - especially when the solution feels so close.

UPDATE: The data is fairly simple, the RefId is incremented for each case, the TypeID can be any number, though only 1 to 8 are modelled currently. Thus you might have:

RefID TypeID
12  2
12  7
13  1
14  1
14  3
14  6

And this will hopefully be modelled as

SELECT Method from @CaseSites
Method 
...
12  2,7
13  1
14  1,3,6
...
4

2 回答 2

1

我认为您的问题是因为更新语句每行仅评估一次“SET Method =”，因此您只能在列表中获得一个值。

UDF 将是执行此操作的简单方法，但由于您使用的是临时表，这可能不是一个选项，并且您无论如何都希望避免使用它们。因此，您可能需要使用光标（不是很好），但可以按照您想要的方式完成工作。

这是我根据您的原始 sql 提出的。

DECLARE myCURSOR Cursor
FOR
  Select BriefID
  from #CaseSites

Open myCursor
DECLARE @BriefID int
DECLARE @CETList varchar(30)
Fetch NEXT FROM myCursor INTO @BriefID
While (@@FETCH_STATUS <> -1)
BEGIN
  IF (@@FETCH_STATUS <> -2)

  SET @CETList = ''
  SELECT @CETList = COALESCE(@CETList + ',', '') + CAST(CETL.[TypeID] AS varchar)
    FROM #CaseEventTypeList CETL 
   WHERE CETL.RefID = @BriefID 

  UPDATE #CaseSites
     SET Method = @CETList
   WHERE BriefID = @BriefID

  Fetch NEXT FROM myCursor INTO @BriefID
END
CLOSE myCursor
DEALLOCATE myCursor
于 2009-11-05T15:43:35.830 回答
0

如果您可以使用 xml，我找到了比我的第一个更好的答案：使用 xml 的相关子查询。

UPDATE #CaseSites 
   SET Method = (   
                  select  cast([TypeID] as varchar(30))+ ',' 
                    from #CaseEventTypeList
                   where RefID = CE.CaseID 
                     for xml path ('') 
                )
  FROM #CaseEvents CE
于 2009-11-05T16:37:53.007 回答