Swaping Columns in Single Query

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Swaping Columns in Single Query

VamsiKrishna.Musunuru

SSC Enthusiast

Points: 132
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August 25, 2006 at 6:40 am

#114103

Hi,
I Have Table called Numbers which Contains Columns Num1 and Num2 of same data type. I want a Single Query to swap the rows in the Table. The condition is not to use Temporary Table.

Viewing 6 posts - 1 through 5 (of 5 total)

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Kenneth Wilhelmsson SSC-Dedicated Points: 30043 More actions · Answer 1

Swap how? By looking, or permanently? (assume you mean 'swap columns' rather than 'rows')

-- just looking

select num2, num1 from numbers

-- permanent change

update numbers

set num1 = num2,

num2 = num1

/Kenneth

Gopi Muluka SSCarpal Tunnel Points: 4594 More actions · Answer 2

You can try this

create table Numbers (num1 int,num2 int)

insert into Numbers values(1,2)

insert into Numbers values(3,4)

insert into Numbers values(5,6)

declare @temp int

Update Numbers

set @temp=Num1, Num1=Num2, Num2=@temp

VamsiKrishna.Musunuru SSC Enthusiast Points: 132 More actions · Answer 3

Yes I got it.Thanks for taking time to reply......

Can we Write a Query to find the Max Number of two given numbers? If so please help me

VamsiKrishna.Musunuru SSC Enthusiast Points: 132 More actions · Answer 4

I tried the Query I got it.

The Query is

declare @num1 int

declare @num2 int

set @num1 = 1

set @num2 = 1

select (case when @num1 > @num2 then @num1 else @num2 end)

Jeff Moden SSC Guru Points: 1004414 More actions · Answer 5

Just for grins...

DECLARE @Num1 FLOAT

DECLARE @Num2 FLOAT

SET @Num1 = -1.2

SET @Num2 = -3.4

SELECT Largest = (ABS(Num2-Num1)+(Num2+Num1))/2

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

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