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Discuss content posted by Cary England
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Order By Clause
51 posts, Page 5 of 6
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Order By Clause
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skrilla99
skrilla99
Posted Wednesday, September 07, 2011 11:20 AM
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Thanks for the question!
-Dan
Post #1171285
L' Eomot Inversé
L' Eomot Inversé
Posted Wednesday, September 07, 2011 4:13 PM
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Good question.
I got it wrong. Q1 is obviously wroing, and I immediately concluded it was all about "order by" and just skim the rest for "order by" related errors - so missed the obvious problem with 4. Another confirmation that one should read code carefully, not skim it carelessly.
Tom
Is minic a gheibheann béal oscailte dorn dúnta.
Is minig a cheapas beul fosgailte dòrn dùinte.
http://es.linkedin.com/in/tomthomsonsoftware
Post #1171440
L' Eomot Inversé
L' Eomot Inversé
Posted Wednesday, September 07, 2011 4:23 PM
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But of course one could say that the query processing ought to notice that there is no ambiguity in number 4, because any possible ambiguity is eliminated by the ON clause of the join. Would such ambiguity elimination be a good thing or a bad thing? I'm in two minds about it.
Tom
Is minic a gheibheann béal oscailte dorn dúnta.
Is minig a cheapas beul fosgailte dòrn dùinte.
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Post #1171443
cengland0
cengland0
Posted Wednesday, September 07, 2011 9:13 PM
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Tom.Thomson (9/7/2011)
But of course one could say that the query processing ought to notice that there is no ambiguity in number 4, because any possible ambiguity is eliminated by the ON clause of the join. Would such ambiguity elimination be a good thing or a bad thing? I'm in two minds about it.
Because the two values are equal, I agree that it's not technical ambiguity; however, you can use nonequalities in the joins too like:
ON Column1 > Column2
Shouldn't happen often but the complexities in the query optimizer would be too difficult for Microsoft to handle
And to make it clear, it was due to the ORDER BY clause so the subject of the QOTD was still okay. If you were to remove the ORDER BY clauses, all 4 queries would run properly. Query 1 and 4 fail because of the invalid ORDER BY clauses -- not because of any other reason.
Post #1171499
CoolCodeShare
CoolCodeShare
Posted Wednesday, September 07, 2011 10:38 PM
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Thanks for the nice questions!!
Post #1171515
davidbhewes
davidbhewes
Posted Thursday, September 08, 2011 8:25 AM
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I agree.. Never would have put the Order by in the sub because I don't see the reason too. So I would have never learn it would fail until now
Post #1171769
Britt Cluff
Britt Cluff
Posted Tuesday, September 13, 2011 5:22 AM
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Really had to think through this one. Thanks for a tough question of the day.
http://brittcluff.blogspot.com/
Post #1174010
jitesh-430609
jitesh-430609
Posted Tuesday, November 01, 2011 1:55 AM
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3rd will also fail since ambiguous column with order by.
Post #1198476
Nandhini Ramanujam
Nandhini Ramanujam
Posted Thursday, May 31, 2012 2:13 AM
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Query 3 would fail because both tables contain employee id column but, alias name of employee id have not been used in order by clause. Please check for the Query 3 and revert back.
Post #1308794
cengland0
cengland0
Posted Sunday, June 03, 2012 7:12 AM
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Nandhini Ramanujam (5/31/2012)
Query 3 would fail because both tables contain employee id column but, alias name of employee id have not been used in order by clause. Please check for the Query 3 and revert back.
Query 3 does not fail. if there is more than one EmployeeID column, the ORDER BY clause uses the one that is in the select statement. There is only one in the select statement so the query executes just fine.
Post #1310213
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