Comments on: SQL SERVER – Transaction and Local Variables – Swap Variables – Update All At Once Concept

By: madhivanan

madhivanan — Tue, 01 Nov 2011 14:38:44 +0000

update table
set col=case when col=’M’ then ‘F’ when col=’F’ then ‘M’ end

By: Amit Kumar Jain

Amit Kumar Jain — Mon, 31 Oct 2011 05:46:38 +0000

it is a great query, how can we do it if we swap the values in the same column. Like we are storing “Sex” it may be “F” or “M” we have mistakenly store “M” in place of “F” and “F” in place of “M”.

Now I want to correct the “Sex”, I want to replace “M” to “F” and “F” to “M” on single column.

By: dineshrajan

dineshrajan — Thu, 19 May 2011 06:19:45 +0000

Good one

By: Dan Pretselman

Dan Pretselman — Fri, 01 Apr 2011 13:37:19 +0000

Great examples, as always.

For more examples and explanations
you can refer to:

http://madebysql.blogspot.com/2010/04/local-variables-and-transaction-or-allhtml.

By: Srinivasan

Srinivasan — Sat, 06 Mar 2010 23:58:24 +0000

Hello Sir,

Only today i came across your blog when searching for some sql clarifications. I read your blog. Its amazing. To be frank i was searching for such kind of blog for a long time.

can you please give me solution for two of my Probs that i am facing for a long time?

1. What should i install in client place for running my application developed with SQL Server. Right Now am installing MSDE, but is there any other solution for that coz its nearly 35 mb and my online clients feel its bit tedious.

2. What version of MSDE should I install for Windows 7 and Vista?

Thank you. Expecting for your reply.
With regards
Srinivasan. R

By: Madhivanan

Madhivanan — Fri, 05 Mar 2010 08:02:14 +0000

I dont understand what you say
Can you give more informations?

Regarding EXCEL, read this

http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=49926

By: Madhivanan

Madhivanan — Fri, 05 Mar 2010 08:01:20 +0000

Can you post the actual cod you used?

By: Sarika

Sarika — Fri, 05 Mar 2010 04:18:16 +0000

How can i retrieve data in the form of tables in the database from any mdf ,ldf ,ndf file & excel sheet ?

By: Sarika

Sarika — Fri, 05 Mar 2010 04:11:00 +0000

if i write union keyword after select ‘May’,'Fri’ this query then why it is not printing the previous values that are not swapped as when i did this it was showing the final values means swapped values.I couldn’t understand this.

By: SQL SERVER – Order of Columns in Update Statement Does not Matter Journey to SQL Authority with Pinal Dave

Fri, 05 Mar 2010 01:31:47 +0000

[...] SQL SERVER – Transaction and Local Variables – Swap Variables – Update All At Once Concept Update All at Once concept is purely based on Atomicity (link goes to Wikipedia). In an atomic transaction, a series of database operations, either all of them occur, or nothing occurs. A guarantee of atomicity prevents updates to the database occurring only partially, which can cause greater problems than rejecting the whole series outright. [...]

By: Madhivanan

Madhivanan — Mon, 01 Mar 2010 08:33:17 +0000

What is the difference between my solution?
You just shortcut the variable names

By: dURGESH

dURGESH — Sat, 05 Sep 2009 18:52:21 +0000

DECLARE @A INT, @B INT
SELECT @A=1,@B=2
SELECT @A A,@B B
SELECT @A=@A+@B,@B=@A-@B,@A=@A-@B
SELECT @A A,@B B

By: Madhivanan

Madhivanan — Mon, 03 Nov 2008 13:57:18 +0000

For valriable swappings, you dont need a temp variable

DECLARE @VarA INT
DECLARE @VarB INT
DECLARE @VarTemp INT

SET @VarA = 1
SET @VarB = 2

SELECT @VarA =@VarA +@VarB,@VarB=@VarA- @VarB,@VarA=@VarA-@VarB

SELECT @VarA VarA, @VarB VarB

By: Paris

Paris — Sat, 01 Nov 2008 23:33:02 +0000

always ur articles r usefule .. merci ;)

By: Jerry Hung

Jerry Hung — Mon, 20 Oct 2008 19:21:06 +0000

This behaviour will be what I expected, thank god
being ATOMIC

For example
UPDATE table
SET column = GETDATE()

All columns obtain the same GETDATE() value, instead of milliseconds apart for a large table