Comments on: SQL SERVER – A Puzzle – Swap Value of Column Without Case Statement

By: Arif

Arif — Mon, 18 Feb 2013 10:48:02 +0000

UPDATE SIMPLETABLE A
SET GENDER = (SELECT DISTINCT GENDER
FROM SIMPLETABLE B
WHERE A.GENDER B.GENDER)

By: deepa

deepa — Thu, 27 Dec 2012 06:32:17 +0000

nice article…..:)

By: Mitesh

Mitesh — Fri, 21 Dec 2012 13:56:56 +0000

USE tempdb
GO
DECLARE @SimpleTable TABLE (
ID INT, Gender VARCHAR(10)
)
INSERT INTO @SimpleTable (ID, Gender)
SELECT 1, ‘female’
UNION ALL
SELECT 2, ‘male’
UNION ALL
SELECT 3, ‘male’

Update S SET Gender = E.Gender from @SimpleTable S
CROSS JOIN (SELECT DISTINCT Gender from @SimpleTable)E
WHERE S.Gender E.Gender

select * from @SimpleTable

By: Girish

Girish — Thu, 29 Nov 2012 15:16:29 +0000

Thanks for the solution Eric,

By: Girish

Girish — Thu, 29 Nov 2012 15:15:41 +0000

Thanks sandeep, its working. I am looking for this kind of statement.

By: sandeepmittal11

sandeepmittal11 — Thu, 29 Nov 2012 05:07:06 +0000

DECLARE @tab TABLE( val VARCHAR(MAX))
insert into @tab VALUES
(‘AASDFADFAGE,CLODFVER’), (‘ISDRFOQUASA,GREG,FIRIEN’),
(‘ADADFDS,ZSERCL1VER’), (‘DIOFFISFW,AFGREG,GGFRIEN’)

select REPLICATE(‘True,’,LEN(val)-LEN(REPLACE(val,’,',”)))+’True’
from @tab

By: Eric Bradford

Eric Bradford — Wed, 28 Nov 2012 19:14:39 +0000

DECLARE @tab TABLE ( val VARCHAR(MAX) )
INSERT INTO @tab
VALUES ( ‘asa’ ),
( ‘AASDFADFAGE,CLODFVER’ ),
( ‘ISDRFOQUASA,GREG,FIRIEN’ ),
( ‘ADADFDS,ZSERCL1VER’ ),
( ‘DIOFFISFW,AFGREG,GGFRIEN’ );
WITH Numbers ( X )
AS ( SELECT 1
UNION ALL
SELECT x + 1
FROM Numbers
WHERE X < 1000
)
SELECT val ,
REPLACE(RTRIM(REPLICATE('True ', SUM(N) + 1)), ' ', ',') AS Result
FROM Numbers T1
CROSS APPLY ( SELECT val ,
CASE WHEN SUBSTRING(val, x, 1) = ','
THEN 1
ELSE 0
END AS N
FROM @tab
WHERE x < LEN(val)
) T2
GROUP BY VAL
OPTION ( MAXRECURSION 1000 )

By: Eric Bradford

Eric Bradford — Wed, 28 Nov 2012 18:34:43 +0000

DECLARE @tab TABLE( val VARCHAR(MAX))
insert into @tab VALUES
(‘AASDFADFAGE,CLODFVER’), (‘ISDRFOQUASA,GREG,FIRIEN’),
(‘ADADFDS,ZSERCL1VER’), (‘DIOFFISFW,AFGREG,GGFRIEN’)

;WITH CTE (val, X)
AS
(SELECT val, CHARINDEX( ‘,’, val, 1)
FROM @tab
UNION ALL
SELECT val, CHARINDEX( ‘,’, val, X+1)
FROM CTE
WHERE CHARINDEX( ‘,’, val, X+1) 0)
SELECT val, REPLACE(RTRIM(REPLICATE (‘True ‘,COUNT(*) +1)),’ ‘, ‘,’) FROM CTE
GROUP BY val

By: Girish

Girish — Wed, 28 Nov 2012 17:17:45 +0000

Can you please try this string to replace.

I want to replace a Value from a record like as shown below,

AASDFADFAGE,CLODFVER to True,True
ISDRFOQUASA,GREG,FIRIEN to True,True,True
ADADFDS,ZSERCL1VER to True,True
DIOFFISFW,AFGREG,GGFRIEN to True,True,True

With out using XML. Any suggestions please…

By: Girish

Girish — Wed, 28 Nov 2012 15:05:44 +0000

Thanks Sandeep. i am using XML, without Function. There is a performance hit, So any other way.

By: sandeepmittal11

sandeepmittal11 — Wed, 28 Nov 2012 05:32:55 +0000

CREATE FUNCTION fn_replacevalues(
@delimited NVARCHAR(MAX),
@delimiter NVARCHAR(100)
) RETURNS VARCHAR(MAX)
AS
BEGIN
DECLARE @xml XML
DECLARE @retval VARCHAR(MAX)
SET @xml = N” + REPLACE(@delimited,@delimiter,”) + ”
SELECT @retval = STUFF((SELECT ‘,’ + ‘True’ FROM @xml.nodes(‘/t’) as records(r) FOR XML PATH(”)),1,1,”)
RETURN @retval
END

DECLARE @tab TABLE( val VARCHAR(MAX))
insert into @tab VALUES
(‘AASDFADFAGE,CLODFVER’), (‘ISDRFOQUASA,GREG,FIRIEN’),
(‘ADADFDS,ZSERCL1VER’), (‘DIOFFISFW,AFGREG,GGFRIEN’)

SELECT dbo.fn_replacevalues(val, ‘,’)
FROM @tab

By: Girish

Girish — Tue, 27 Nov 2012 21:59:43 +0000

Sorry for the alignment,

It should be like

AASDFADFAGE,CLODFVER to True,True
ISDRFOQUASA,GREG,FIRIEN to True,True,True
ADADFDS,ZSERCL1VER to True,True
DIOFFISFW,AFGREG,GGFRIEN to True,True,True

By: Girish

Girish — Tue, 27 Nov 2012 21:36:41 +0000

I want to replace a Value from a record like as shown below,

AASDFADFAGE,CLOVER True,True
ISDRFOQUASA,GREG,FIRIEN True,True,True
ADADFDS,ZSERCL1VER True,True
DIOFFISFW,AFGREG,GGFRIEN True,True,True

Any suggestions please…

By: Vibin M Lazar

Vibin M Lazar — Tue, 30 Oct 2012 11:09:32 +0000

I think the first answer is simple and more understandable…

Any way thanks for new ideas.. :-)

With regards,

Vibin M Lazar
Calicut

By: Saurabh Maurya

Saurabh Maurya — Tue, 19 Jun 2012 11:07:22 +0000

Below also works well and can be implemented for more than one columns if to be swapped-
UPDATE GENDERS set gender=G2.SwappedGender
FROM GENDERS G1, (select GENDER, (CASE WHEN GENDER=’male’ THEN ‘FEMALE’ ELSE ‘MALE’ END) as SwappedGender from genders) as G2
WHERE G1.GENDER=G2.GENDER

By: SQL SERVER – Simple Explanation and Puzzle with SOUNDEX Function and DIFFERENCE Function « SQL Server Journey with SQL Authority

Sat, 16 Jun 2012 01:31:14 +0000

[...] a question where I asked how to Swap Values of the column without using CASE Statement. Read here: A Puzzle – Swap Value of Column Without Case Statement,there were more than 50 solutions proposed in the comment. There were many creative solutions. I [...]

By: SQL SERVER – Solution of Puzzle – Swap Value of Column Without Case Statement « SQL Server Journey with SQL Authority

Thu, 14 Jun 2012 01:31:43 +0000

[...] a question where I asked how to Swap Values of the column without using CASE Statement. Read here: SQL SERVER – A Puzzle – Swap Value of Column Without Case Statement. I have proposed 3 different solutions in the blog posts itself. I had requested the help of the [...]

By: Brian Tkatch

Brian Tkatch — Mon, 11 Jun 2012 15:55:34 +0000

UPDATE
SimpleTable
SET
Gender = SUBSTRING(‘fe’+ Gender, POWER(LEN(Gender) % 4, 2) + 1, 6)

By: Eric Bradford

Eric Bradford — Mon, 11 Jun 2012 12:17:14 +0000

WHERE Swap.Gender T1.Gender

Problem submitting code. The different then symbol is interpreted as empty HTML tag

By: Eric Bradford

Eric Bradford — Mon, 11 Jun 2012 12:11:21 +0000

WITH Swap
AS (SELECT ‘male’ AS Gender
UNION ALL
SELECT ‘female’)
UPDATE T1
SET gender = Swap.Gender
FROM SimpleTable T1
CROSS JOIN Swap
WHERE Swap.Gender T1.Gender

By: sandeepmittal11

sandeepmittal11 — Sat, 09 Jun 2012 09:54:11 +0000

DECLARE @TAB TABLE (ID INT, Gender VARCHAR(10))
INSERT INTO @TAB
SELECT 1, ‘female’
UNION ALL SELECT 2, ‘male’
UNION ALL SELECT 3, ‘male’

UPDATE T1
SET T1.Gender = T2.Gender
FROM (
SELECT DENSE_RANK() OVER (ORDER BY Gender) AS ROWID , ID, Gender
FROM @TAB
) T1 INNER JOIN (
SELECT Gender, ROW_NUMBER() OVER (ORDER BY Gender DESC) AS ROWID
FROM ( SELECT DISTINCT Gender FROM @TAB) T
) T2 ON T1.ROWID = T2.ROWID

SELECT * FROM @TAB

By: sandeepmittal11

sandeepmittal11 — Sat, 09 Jun 2012 09:37:00 +0000

–Solution : 1
DECLARE @TAB TABLE (ID INT, Gender VARCHAR(10))
INSERT INTO @TAB
SELECT 1, ‘female’
UNION ALL SELECT 2, ‘male’
UNION ALL SELECT 3, ‘male’

DECLARE @list VARCHAR(100)
SET @list = (SELECT DISTINCT ‘,’ + Gender FROM @TAB FOR XML PATH(”))
SELECT ID, REPLACE(REPLACE(@list, ‘,’ + Gender, ”),’,',”) AS Gender
FROM @TAB

– Solution : 2 (if having even more than 2 distinct values)
–This will replace 1 value with 2, 2 with 3, 3 with n, n with 1
DECLARE @TAB TABLE (ID INT, Val VARCHAR(10))
INSERT INTO @TAB
SELECT 1, ‘AAA’
UNION ALL SELECT 2, ‘BBB’
UNION ALL SELECT 3, ‘BBB’
UNION ALL SELECT 4, ‘CCC’
UNION ALL SELECT 5, ‘CCC’

;WITH CTE AS(
SELECT ROW_NUMBER() OVER (ORDER BY Val) AS ROWID , Val
FROM ( SELECT DISTINCT Val FROM @TAB ) TAB
), CTEMIN AS (SELECT TOP 1 Val FROM CTE ORDER BY ROWID)

SELECT T1.ID, COALESCE(T2.Val, CTEMIN.Val) as Val
FROM (
SELECT ID, DENSE_RANK() OVER (ORDER BY Val) AS ROWID, Val FROM @TAB
) T1 LEFT JOIN CTE T2 ON T1.ROWID = T2.ROWID -1
CROSS APPLY CTEMIN
ORDER BY T1.ID

By: Sandeep Mittal

Sandeep Mittal — Sat, 09 Jun 2012 09:35:32 +0000

–Solution : 1
DECLARE @TAB TABLE (ID INT, Gender VARCHAR(10))
INSERT INTO @TAB
SELECT 1, ‘female’
UNION ALL SELECT 2, ‘male’
UNION ALL SELECT 3, ‘male’

DECLARE @list VARCHAR(100)
SET @list = (SELECT DISTINCT ‘,’ + Gender FROM @TAB FOR XML PATH(”))
SELECT ID, REPLACE(REPLACE(@list, ‘,’ + Gender, ”),’,',”) AS Gender
FROM @TAB

;WITH CTE AS(
SELECT ROW_NUMBER() OVER (ORDER BY Val) AS ROWID , Val
FROM ( SELECT DISTINCT Val FROM @TAB ) TAB
), CTEMIN AS (SELECT TOP 1 Val FROM CTE ORDER BY ROWID)

By: Aneel

Aneel — Sat, 09 Jun 2012 06:27:11 +0000

The second version looks cooler :-)

By: Aneel

Aneel — Sat, 09 Jun 2012 06:25:40 +0000

This is cool. Similar to my approach proposed above except that you are not using colaesce and also you are not using a from clause (which I forgot is possible in SQL Server thanks to my experience in Oracle :-))…