T-SQL Cursors

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T-SQL Cursors

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computergirl

Posted Tuesday, October 16, 2012 9:03 PM

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Okay I am kind of new to this and I am trying to create a table and if the user doesn't fill all the fields I need the empty field to not be shown just the fields that are filled. How can I do this using a cursor? Any pointers??

thanks in advance

Post #1373605

sriren6029

Posted Tuesday, October 16, 2012 10:14 PM

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computergirl (10/16/2012)

Could you elaborate on this one. Some thing like a sample so, that we could answer or give ideas on your question. Smile

Post #1373615

dwain.c

Posted Thursday, November 01, 2012 6:55 PM

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computergirl (10/16/2012)

Agreed that elaboration is needed.

First of all you refer to "fields" but SQL tables contain "columns." How many columns?

Neither can columns be "empty" - they can be NULL (which is another way to say the value is unknown).

Are you saying you want to write a query that only returns a column if that column does not contain a NULL value?

Refer to the first line in my signature. If you are new it's not too late for you. Don't think about CURSORs as a first resort. SQL processes sets, so you should think of sets first and 99.9% of the time you can solve the problem without resorting to a CURSOR (that should always be a last resort).

No loops! No CURSORs! No RBAR! Hoo-uh!

INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?

Need to UNPIVOT? Why not CROSS APPLY VALUES instead?
Since random numbers are too important to be left to chance, let's generate some!
Are you too recursively challenged?
Splitting strings based on patterns can be fast!

Post #1380098

IgorMi

Posted Tuesday, November 13, 2012 2:13 PM

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computergirl (10/16/2012)

Hi,
Because you're a newbie you'd better read this first: http://www.sqlservercentral.com/articles/Best+Practices/61537/

May be you think of usage ISNULL, COALESCE, or something else ... in your loop, but with such explanation we could just imagine what you need.

Regards
IgorMi

Post #1384298

aaron.reese

Posted Thursday, November 15, 2012 9:27 AM

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This doesn't read like an SQL issue, more a GUI issue.

I may be wrong but it sounds like what she wants is that if the field is NULL then do not display the field on the form

Changing the number of columns returned by a query would require Dynamic SQL which should be avoided whenever possible for a number of reasons
(SQL injection attacks and query plan cacheing to name two)

Post #1385242

Sean Pearce

Posted Wednesday, March 06, 2013 3:28 AM

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This sounds like an issue for the presentation layer and not the data layer.

The SQL Guy @ blogspot

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