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sql help

Posted on 2016-09-20
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Last Modified: 2016-09-23
I am trying to update the table. where I have following columns:
folioNo,pgPos,PgName,

folioNo is the order
pgPos is either right or left (if folioNo is odd then put L (left) if even put R(right)) . Let say I want to add another FolioNo in beteween 11 and 12. I will need to make new itemWith a folio 12 and PgPos R. and the following reordered accordingly with update in folioNo and PgPos
sample data
PDF_Filename	FolioNo	PgPos	
A-1	                             11	 	R	
A-2	                            12      	      L	
A-3	                              13      	R		
A-4	                            14	         L	
A-5	                            15	      R	
A-6	                            16	       L	

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With cte As
(
SELECT folioNo,pgPos,
ROW_NUMBER() OVER (ORDER BY folioNo ) AS RN
FROM  tbl_160154dd
)

SELECT * FROM cte

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0
Comment
Question by:erikTsomik
5 Comments
 
LVL 23

Expert Comment

by:Pawan Kumar
ID: 41807864
@Author - Do you need an update query or Select Query?
0
 
LVL 23

Accepted Solution

by:
Pawan Kumar earned 500 total points
ID: 41807867
Bro try this..

--


;With cte As
(
	SELECT folioNo,pgPos,
	ROW_NUMBER() OVER (ORDER BY folioNo ) AS RN
	FROM  tbl_160154dd
)
UPDATE x
SET x.pgPos = CASE WHEN RN % 2 = 0 THEN 'R' ELSE 'L' END 
FROM cte x


--

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--
0
 
LVL 65

Expert Comment

by:Jim Horn
ID: 41807885
It would help if you can give us a data mockup of your desired return set, as it's not clear from the description.  Thanks.
0
 
LVL 19

Author Comment

by:erikTsomik
ID: 41807897
I would expect something like this

PDF_Filename	FolioNo	PgPos	
A-1	                             11	 	R	
A-5                               12              L     I added this record
A-2	                             13      	       R	
A-3	                             14      	       L		
A-4	                             15	       R	
A-5	                             16	       L	
A-6	                             17	       R	

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0
 
LVL 48

Expert Comment

by:PortletPaul
ID: 41807997
Consider using a "computed column" instead

With this approach as soon as you insert a new row it will calculate the L or R value for you without needing an update.

ALTER TABLE tbl_160154dd
ADD [ComputedColumn] AS CASE WHEN RN % 2 = 0 THEN 'R' ELSE 'L' END

If you want to continue using [pgPos] as the column name you would need to drop that column first, then add it with the calculation

Note: It is possible to "persist" (store) the calculation, refer to the URL above for more details on this.
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