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SELECT Question?

Author

Topic

raysefo
Constraint Violating Yak Guru

260 Posts

Posted - 2010-06-30 : 08:32:40

Hi,

I want to retrieve data under some conditions like below;

SELECT T.A,T.B
FROM TABLE1 T
WHERE T.X = PARAM1 AND T.Y = PARAM2

what i need to do is, to retrieve data ;
1) if no params (PARAM1 and PARAM2) entered
2) if one of the params (PARAM1 or PARAM2) entered
3) both of the params (PARAM1 and PARAM2) entered

Is there a way to constructa single SELECT statement?

madhivanan
Premature Yak Congratulator

22864 Posts

Posted - 2010-06-30 : 08:35:03

SELECT T.A,T.B
FROM TABLE1 T
WHERE (@param1 is null or T.X = @PARAM1) AND (@param2 is null or T.Y = PARAM2)

Madhivanan

Failing to plan is Planning to fail

webfred
Master Smack Fu Yak Hacker

8781 Posts

Posted - 2010-06-30 : 08:44:14

Also consider this:
http://sqlinthewild.co.za/index.php/2009/03/19/catch-all-queries/

No, you're never too old to Yak'n'Roll if you're too young to die.

raysefo
Constraint Violating Yak Guru

260 Posts

Posted - 2010-06-30 : 09:25:35

thanks so much both of u.

X002548
Not Just a Number

15586 Posts

Posted - 2010-06-30 : 09:39:21

So Gila's answer is Dynamic SQL????

Couldn't M$ haven't written a hack on the optimizer like so many other things that they have done to date?

And no mention of

t.x = COALESCE(@Param1,t.x)

???

Gotta test this one

Brett

8-)

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Lamprey
Master Smack Fu Yak Hacker

4614 Posts

Posted - 2010-06-30 : 11:21:02

quote:
Originally posted by X002548

And no mention of

t.x = COALESCE(@Param1,t.x)

That's the same as

t.x = CASE WHEN @Param1 IS NULL THEN t.x ELSE @Param1 END

So, CAOLESCE is not any better, unfortunatly.

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