Comments on: SQL SERVER – Email from Blog Reader – Not a Potential Bug in SQL – Puzzle

By: Amit

Amit — Wed, 15 Jul 2009 11:25:37 +0000

Its a good catch…You are doin a very good job Pinal…Ye dil maange more…

By: Virendra Dugar

Virendra Dugar — Thu, 26 Feb 2009 10:29:43 +0000

Hi Pinal,

I was the one who mailed you..
Thanks for the info.
Will meet you for sure as I live in ahmedabad only.

By: Srinivas Gudimella

Srinivas Gudimella — Tue, 30 Dec 2008 22:39:45 +0000

Hi Friends,

There is one more SEVERE Bug according me in SQL Server which I posted in MSDN Forum (link below). I did not get a satisfactory answer. The issue is basically you can create database objects without specifying a name. Look at the link below and send your responses……I am not sure if this got rectified in SQL Server 2008 but for sure this is an issue till SQL Server 2005.

The only reply I got from the forum was not satisfactory. Why should I create DDL trigger to check for blank table names or procedure names? The system should automatically take care of this scenario.

http://social.msdn.microsoft.com/forums/en-US/sqldatabaseengine/thread/568f01fc-abca-4658-8307-170b1284c60f

Regards
Srinivas Gudimella

By: Seema

Seema — Tue, 23 Dec 2008 10:42:01 +0000

Interesting.

By: Kristina

Kristina — Mon, 22 Dec 2008 15:38:31 +0000

I like this puzzle example, I’d like more, especially relating to achieving an “answer” maximum efficiency. Like giving one query, make it run x% faster.

By: mahi

mahi — Wed, 17 Dec 2008 16:56:37 +0000

Pinal,

Thanks to the reader who found this issue and thanks to you for posting it. Please, please do post articles/puzzles like these. It is very helpful in understanding SQL Server behaviour.

Regards,
Mahi

By: Ruppel

Ruppel — Tue, 16 Dec 2008 18:48:06 +0000

I am not your reader, but I think I will became one ;)

By: Gajanan

Gajanan — Mon, 15 Dec 2008 07:01:09 +0000

This is very interesting.

By: R.Scott

R.Scott — Sun, 14 Dec 2008 19:47:29 +0000

Dear Pinal:
I have been reading your blog for some time now–I grab it on my Google Reader and share with friends. I really enjoy all the subjects, all the puzzles and problems including this one. I don’t yet have the expertise (not even remotely close) that you and many of your readers possess, but your blog helps me quite a bit. I just thought I’d let you know that to encourage more puzzles and solutions. Thanks for doing what you do. It helps those of us at the begging of this SQL journey tremendously.

Sincerely,
R.Scott

By: NANDAKUMAR

NANDAKUMAR — Sat, 13 Dec 2008 04:32:56 +0000

Dear Pinal,

Nice Article. I’m also come across the similar situation. I guess I found here, instead of using ‘IN’ clause, it is better recommended to use ‘EXISTS’ clause. And its performance also be favour to Server.

The UPDATE statement in the email can be better replaced by

UPDATE tblAPPLICANTS SET ISCOMPLETED=1 WHERE ENQUIRYID=1 AND EXISTS(SELECT 1 FROM tblENQUIRY WHERE ENQUIRYID=tblAPPLICANTS.ENQUIRYID)

UPDATE tblAPPLICANTS SET ISCOMPLETED=1 WHERE EXISTS(SELECT 1 FROM tblENQUIRY WHERE ENQUIRYID=tblAPPLICANTS.ENQUIRYID AND ENQUIRYID=1)

Thanks & Regds

Nandakumar M

By: Tok

Tok — Sat, 13 Dec 2008 03:42:29 +0000

Nice one Pinal!

I can see how this would catch a lot of people out. It’s certainly not clear on first look, as to what’s happening.

It’s a good argument for fully qualifying your columns in subqueries, I think.

Definitely have more articles like this one, please!