TSQL Pivot without aggregate function

问题:

I have a table like this...

CustomerID   DBColumnName   Data
--------------------------------------
1            FirstName      Joe
1            MiddleName     S
1            LastName       Smith
1            Date           12/12/2009
2            FirstName      Sam
2            MiddleName     S
2            LastName       Freddrick
2            Date           1/12/2009
3            FirstName      Jaime
3            MiddleName     S
3            LastName       Carol
3            Date           12/1/2009

And I want this...

Is this possible using PIVOT?

CustomerID  FirstName   MiddleName          LastName        Date
----------------------------------------------------------------------
1           Joe             S               Smith           12/12/2009
2           Sam             S               Freddrick       1/12/2009
3           Jaime           S               Carol           12/1/2009

回答1:

You can use the MAX aggregate, it would still work. MAX of one value = that value..

In this case, you could also self join 5 times on customerid, filter by dbColumnName per table reference. It may work out better.

回答2:

yes, but why !!??

   Select CustomerID,
     Min(Case DBColumnName When \'FirstName\' Then Data End) FirstName,
     Min(Case DBColumnName When \'MiddleName\' Then Data End) MiddleName,
     Min(Case DBColumnName When \'LastName\' Then Data End) LastName,
     Min(Case DBColumnName When \'Date\' Then Data End) Date
   From table
   Group By CustomerId

回答3:

Ok, sorry for the poor question. gbn got me on the right track. This is what I was looking for in an answer.

SELECT [FirstName], [MiddleName], [LastName], [Date] 
FROM #temp 
PIVOT
(   MIN([Data]) 
    FOR [DBColumnName] IN ([FirstName], [MiddleName], [LastName], [Date]) 
)AS p

Then I had to use a while statement and build the above statement as a varchar and use dynmaic sql.

Using something like this

SET @fullsql = @fullsql + \'SELECT \' + REPLACE(REPLACE(@fulltext,\'(\',\'\'),\')\',\'\')
SET @fullsql = @fullsql + \'FROM #temp \'
SET @fullsql = @fullsql + \'PIVOT\'
SET @fullsql = @fullsql + \'(\'
SET @fullsql = @fullsql + \' MIN([Data])\'
SET @fullsql = @fullsql + \' FOR [DBColumnName] IN \'+@fulltext
SET @fullsql = @fullsql + \')\'
SET @fullsql = @fullsql + \'AS p\'

EXEC (@fullsql)

Having a to build @fulltext using a while loop and select the distinct column names out of the table. Thanks for the answers.

回答4:

SELECT
main.CustomerID,
f.Data AS FirstName,
m.Data AS MiddleName,
l.Data AS LastName,
d.Data AS Date
FROM table main
INNER JOIN table f on f.CustomerID = main.CustomerID
INNER JOIN table m on m.CustomerID = main.CustomerID
INNER JOIN table l on l.CustomerID = main.CustomerID
INNER JOIN table d on d.CustomerID = main.CustomerID
WHERE f.DBColumnName = \'FirstName\' 
AND m.DBColumnName = \'MiddleName\' 
AND l.DBColumnName = \'LastName\' 
AND d.DBColumnName = \'Date\' 

Edit: I have written this without an editor & have not run the SQL. I hope, you get the idea.

回答5:

WITH pivot_data AS
(
SELECT customerid, -- Grouping Column
dbcolumnname, -- Spreading Column
data -- Aggregate Column
FROM pivot2 
)
SELECT customerid, [firstname], [middlename], [lastname]
FROM pivot_data
PIVOT (max(data) FOR dbcolumnname IN ([firstname],[middlename],[lastname])) AS p;

回答6:

The OP didn\'t actually need to pivot without agregation but for those of you coming here to know how see:

sql parameterised cte query

The answer to that question involves a situation where pivot without aggregation is needed so an example of doing it is part of the solution.

回答7:

Try this:

SELECT CUSTOMER_ID, MAX(FIRSTNAME) AS FIRSTNAME, MAX(LASTNAME) AS LASTNAME ...

FROM
(

SELECT CUSTOMER_ID, 
       CASE WHEN DBCOLUMNNAME=\'FirstName\' then DATA ELSE NULL END AS FIRSTNAME,
       CASE WHEN DBCOLUMNNAME=\'LastName\' then DATA ELSE NULL END AS LASTNAME,
        ... and so on ...
GROUP BY CUSTOMER_ID

) TEMP

GROUP BY CUSTOMER_ID

回答8:

This should work:

select * from (select [CustomerID]  ,[Demographic] ,[Data]
from [dbo].[pivot]
) as Ter

pivot (max(Data) for  Demographic in (FirstName, MiddleName, LastName, [Date]))as bro

回答9:

Here is a great way to build dynamic fields for a pivot query:

--summarize values to a tmp table

declare @STR varchar(1000)
SELECT  @STr =  COALESCE(@STr +\', \', \'\') 
+ QUOTENAME(DateRange) 
from (select distinct DateRange, ID from ##pivot)d order by ID

---see the fields generated

print @STr

exec(\'  .... pivot code ...
pivot (avg(SalesAmt) for DateRange IN (\' + @Str +\')) AS P
order by Decile\')