Comments on: On Counts http://sqlinthewild.co.za/index.php/2009/04/14/on-counts/ A discussion on SQL Server Fri, 03 Sep 2010 13:39:12 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Prakash http://sqlinthewild.co.za/index.php/2009/04/14/on-counts/comment-page-1/#comment-392 Prakash Thu, 30 Jul 2009 13:58:50 +0000 http://sqlinthewild.co.za/?p=183#comment-392 Gail, Thanks a Lot for the Wonderful Explanation.. Gail,

Thanks a Lot for the Wonderful Explanation..

]]> By: Sm http://sqlinthewild.co.za/index.php/2009/04/14/on-counts/comment-page-1/#comment-391 Sm Mon, 08 Jun 2009 11:39:25 +0000 http://sqlinthewild.co.za/?p=183#comment-391 Gail, Now just I have tested but all are same. may be its my dev box. but can you tell me how to calculate CPU time = 16 ms, elapsed time = 15 ms.. And also I tried with mine query Top 1 statements but no difference i found. Can u tell me y so? Sm. Gail, Now just I have tested but all are same. may be its my dev box. but can you tell me how to calculate CPU time = 16 ms, elapsed time = 15 ms.. And also I tried with mine query Top 1 statements but no difference i found. Can u tell me y so?

Sm.

]]> By: Sm http://sqlinthewild.co.za/index.php/2009/04/14/on-counts/comment-page-1/#comment-390 Sm Mon, 08 Jun 2009 11:17:30 +0000 http://sqlinthewild.co.za/?p=183#comment-390 ok, let me test it 'n Come back to you Gail..again..see you...then Sm ok, let me test it ‘n Come back to you Gail..again..see you…then
Sm

]]> By: Gail http://sqlinthewild.co.za/index.php/2009/04/14/on-counts/comment-page-1/#comment-389 Gail Mon, 08 Jun 2009 09:12:51 +0000 http://sqlinthewild.co.za/?p=183#comment-389 Why don't you test it out and tell me? Why don’t you test it out and tell me?

]]> By: Sm http://sqlinthewild.co.za/index.php/2009/04/14/on-counts/comment-page-1/#comment-388 Sm Mon, 08 Jun 2009 05:48:54 +0000 http://sqlinthewild.co.za/?p=183#comment-388 Gail, Instead of "Select 1 from Tablename" IF we use "Select Top 1 " will it decrease performance? Sm Gail,

Instead of “Select 1 from Tablename” IF we use “Select Top 1 ” will it decrease performance?

Sm

]]> By: Gail http://sqlinthewild.co.za/index.php/2009/04/14/on-counts/comment-page-1/#comment-387 Gail Thu, 04 Jun 2009 12:50:13 +0000 http://sqlinthewild.co.za/?p=183#comment-387 It should be. It should be.

]]> By: VBindra http://sqlinthewild.co.za/index.php/2009/04/14/on-counts/comment-page-1/#comment-386 VBindra Thu, 04 Jun 2009 11:07:31 +0000 http://sqlinthewild.co.za/?p=183#comment-386 Great article! I think that COUNT(1) will also be treated in the same way as COUNT(*). Is it correct? Great article!
I think that COUNT(1) will also be treated in the same way as COUNT(*). Is it correct?

]]> By: Christopher http://sqlinthewild.co.za/index.php/2009/04/14/on-counts/comment-page-1/#comment-385 Christopher Wed, 13 May 2009 14:52:46 +0000 http://sqlinthewild.co.za/?p=183#comment-385 great article I loved this one and was brought back it today, when trying to help someone with a problem at SSC: http://www.sqlservercentral.com/Forums/Topic714996-338-3.aspx great article I loved this one and was brought back it today, when trying to help someone with a problem at SSC:
http://www.sqlservercentral.com/Forums/Topic714996-338-3.aspx

]]> By: julio http://sqlinthewild.co.za/index.php/2009/04/14/on-counts/comment-page-1/#comment-384 julio Fri, 01 May 2009 21:46:20 +0000 http://sqlinthewild.co.za/?p=183#comment-384 Excelente información para los que somos movatos Excelente información para los que somos movatos

]]> By: Seb http://sqlinthewild.co.za/index.php/2009/04/14/on-counts/comment-page-1/#comment-383 Seb Tue, 21 Apr 2009 10:00:07 +0000 http://sqlinthewild.co.za/?p=183#comment-383 Do you know why a SELECT COUNT(column1) FROM table1 takes about twice as much time to complete than a SELECT COUNT(column1) FROM table1 WHERE column1 IS NOT NULL? I looked at the execution plans but couldn't find out why there is such a big difference. In my case 97% of the plan is due to an Index Scan in both cases, with the same values in the details. Do you know why a SELECT COUNT(column1) FROM table1 takes about twice as much time to complete than a SELECT COUNT(column1) FROM table1 WHERE column1 IS NOT NULL? I looked at the execution plans but couldn’t find out why there is such a big difference. In my case 97% of the plan is due to an Index Scan in both cases, with the same values in the details.

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