Update One Colum With Other Column Value In Same Table Using Update Table Statement

Jun 14, 2007

Hi,
I have table with three columns as below
table name:exp
No(int) name(char) refno(int)

I have data as below
No name refno
1 a
2 b
3 c

I need to update the refno with no values I write a query as below

update exp set refno=(select no from exp)
when i run the query i got error as
Subquery returned more than 1 value. This is not permitted when the
subquery follows =, !=, <, <= , >, >= or when the subquery is used as
an expression.

I need to update one colum with other column value.
What is the correct query for this ?

Thanks,
Mani

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When Then Muliple Colum Update 1 Statement

Apr 8, 2008

I have about 5 statements like the update below, depending on the PID different columns will be update "C2005, G2005,E2005...."

I would like to use 1 update statement in stead of 5 to update all columns below are 2 original update statements and my attempt at when then update. Note a different column is updated depending on the PID.

If when then isnt possible, any other suggestions are welcomed. Thanks
UPDATE #Sec
SET C2005 = Pos.USD / 1000
FROM #Sec INNER JOIN
Pos ON #Sec.ID = Pos.ID
WHERE (Pos.PID = 'B')

UPDATE #Sec
SET G2005 = Pos.USD / 1000
FROM #Sec INNER JOIN
Pos ON #Sec.ID = Pos.ID
WHERE (Pos.PID = 'G')

UPDATE #Sec
WHEN (Pos.PID = 'C') THEN SET C2005 = Pos.USD / 1000 end
WHEN (Pos.PID = 'G') THEN SET G2005 = Pos.USD / 1000 end
WHEN (Pos.PID = 'E') THEN SET E2005 = Pos.USD / 1000 end
FROM #Sec INNER JOIN
Pos ON #Sec.ID = Pos.ID

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