CODEWITHSUNDEEP
sql-servert-sqlpivot
Tim Cochran
Tim Cochran

Reputation: 1876

SQL Server: Examples of PIVOTing String data

Trying to find some simple SQL Server PIVOT examples. Most of the examples that I have found involve counting or summing up numbers. I just want to pivot some string data. For example, I have a query returning the following.

Action1 VIEW  
Action1 EDIT  
Action2 VIEW  
Action3 VIEW  
Action3 EDIT

I would like to use PIVOT (if even possible) to make the results like so:

Action1 VIEW EDIT  
Action2 VIEW NULL  
Action3 VIEW EDIT

Is this even possible with the PIVOT functionality?

Upvotes: 132

Views: 198659

Answers (7)

1994Nerd
1994Nerd

Reputation: 1

I had a situation where I was parsing strings and the first two positions of the string in question would be the field names of a healthcare claims coding standard. So I would strip out the strings and get values for F4, UR and UQ or whatnot. This was great on one record or a few records for one user. But when I wanted to see hundreds of records and the values for all usersz it needed to be a PIVOT. This was wonderful especially for exporting lots of records to excel. The specific reporting request I had received was "every time someone submitted a claim for Benadryl, what value did they submit in fields F4, UR, and UQ. I had an OUTER APPLY that created the ColTitle and the value fields below

PIVOT(
  min(value)
  FOR ColTitle in([F4], [UR], [UQ])
 )

Upvotes: 0

Vishwanath Dalvi
Vishwanath Dalvi

Reputation: 36611

With pivot_data as
(
select 
action, -- grouping column
view_edit -- spreading column
from tbl
)
select action, [view], [edit]
from   pivot_data
pivot  ( max(view_edit) for view_edit in ([view], [edit]) ) as p;

Upvotes: 5

mxasim
mxasim

Reputation: 2193

Table setup:

CREATE TABLE dbo.tbl (
    action VARCHAR(20) NOT NULL,
    view_edit VARCHAR(20) NOT NULL
);

INSERT INTO dbo.tbl (action, view_edit)
VALUES ('Action1', 'VIEW'),
       ('Action1', 'EDIT'),
       ('Action2', 'VIEW'),
       ('Action3', 'VIEW'),
       ('Action3', 'EDIT');

Your table: SELECT action, view_edit FROM dbo.tbl

Your table

Query without using PIVOT: 

SELECT Action, 
[View] = (Select view_edit FROM tbl WHERE t.action = action and view_edit = 'VIEW'),
[Edit] = (Select view_edit FROM tbl WHERE t.action = action and view_edit = 'EDIT')
FROM tbl t
GROUP BY Action

Query using PIVOT: 

SELECT [Action], [View], [Edit] FROM
(SELECT [Action], view_edit FROM tbl) AS t1 
PIVOT (MAX(view_edit) FOR view_edit IN ([View], [Edit]) ) AS t2

Both queries result:
enter image description here

Upvotes: 56

saranya
saranya

Reputation: 71

From http://blog.sqlauthority.com/2008/06/07/sql-server-pivot-and-unpivot-table-examples/:

SELECT CUST, PRODUCT, QTY
FROM Product) up
PIVOT
( SUM(QTY) FOR PRODUCT IN (VEG, SODA, MILK, BEER, CHIPS)) AS pvt) p
UNPIVOT
(QTY FOR PRODUCT IN (VEG, SODA, MILK, BEER, CHIPS)
) AS Unpvt
GO

Upvotes: 7

Miles D
Miles D

Reputation: 8040

If you specifically want to use the SQL Server PIVOT function, then this should work, assuming your two original columns are called act and cmd. (Not that pretty to look at though.)

SELECT act AS 'Action', [View] as 'View', [Edit] as 'Edit'
FROM (
    SELECT act, cmd FROM data
) AS src
PIVOT (
    MAX(cmd) FOR cmd IN ([View], [Edit])
) AS pvt

Upvotes: 53

John Hubert
John Hubert

Reputation: 2214

Remember that the MAX aggregate function will work on text as well as numbers. This query will only require the table to be scanned once.

SELECT Action,
       MAX( CASE data WHEN 'View' THEN data ELSE '' END ) ViewCol, 
       MAX( CASE data WHEN 'Edit' THEN data ELSE '' END ) EditCol
 FROM t
 GROUP BY Action

Upvotes: 168

vzczc
vzczc

Reputation: 9380

Well, for your sample and any with a limited number of unique columns, this should do it.

select 
    distinct a,
    (select distinct t2.b  from t t2  where t1.a=t2.a and t2.b='VIEW'),
    (select distinct t2.b from t t2  where t1.a=t2.a and t2.b='EDIT')
from t t1

Upvotes: 6

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