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Discuss content posted by Sudhir Chawla
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Dynamic SQL
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Sudhir-192949
Sudhir-192949
Posted Monday, January 04, 2010 9:47 PM
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Comments posted to this topic are about the item
Dynamic SQL
Post #841840
SQLRNNR
SQLRNNR
Posted Monday, January 04, 2010 10:33 PM
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Thanks for the question.
Jason
AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008
SQL RNNR
Posting Performance Based Questions - Gail Shaw
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Post #841847
ziangij
ziangij
Posted Monday, January 04, 2010 10:42 PM
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option C doesn't work, it throws an error while executing in sql 2005.
Post #841850
Ashka Modi
Ashka Modi
Posted Tuesday, January 05, 2010 12:17 AM
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It works fine in 2005. good Question!
Thanks,
Ashka Modi
Software Engineer || credEcard Technologies (india) Pvt. Ltd.
Post #841874
Rupal Raval
Rupal Raval
Posted Tuesday, January 05, 2010 12:20 AM
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what error does it throw?
have you written
'declare @tablevariable varchar(100)
set @tablevariable = 'any valid table name'
Before code C?
map @tablevariable to one of your database table, select that database as current database and then execute the code
Post #841880
kaspencer
kaspencer
Posted Tuesday, January 05, 2010 2:50 AM
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I couldn't see the answer to this question, and so I guessed "C" which happened to be correct.
However, when I tried the three options on my system, "C" returned an error, "B" also returned an error, and "A" returned NULL.
I suspect that my errors had a similar cause to that reported by others. This leads me to make a suggestion for consideration by the adjudicators (if there are any!):
I suggest that before allowing a question to be used, the submitter must ensure that all assumptions and pre-conditions for the question be stated clearly. These assumptions would include such items as database names, table existence, as well as any security or user-privilege features necessary to ensure that the correct response would be produced when the query or procedure is run.
I have noted many instances of reports in this forum when queries have failed (and have had some such myself), and I feel that this shows poor appreciation by the submitter that not every system resembles his own.
Happy New Year to one and all!
Ken.
Post #841925
Dietmar Weickert
Dietmar Weickert
Posted Tuesday, January 05, 2010 3:10 AM
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Cool question! Taught me about a new way to execute dynamic SQL.
Thank you Sudhir.
To all who reported troubles: It works perfectly on my instance of SS2005. What messages did you receive?
Best regards,
Dietmar Weickert.
Post #841934
Lynn Pettis
Lynn Pettis
Posted Tuesday, January 05, 2010 6:34 AM
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kaspencer (1/5/2010)
I couldn't see the answer to this question, and so I guessed "C" which happened to be correct.
However, when I tried the three options on my system, "C" returned an error, "B" also returned an error, and "A" returned NULL.
I suspect that my errors had a similar cause to that reported by others. This leads me to make a suggestion for consideration by the adjudicators (if there are any!):
I suggest that before allowing a question to be used, the submitter must ensure that all assumptions and pre-conditions for the question be stated clearly. These assumptions would include such items as database names, table existence, as well as any security or user-privilege features necessary to ensure that the correct response would be produced when the query or procedure is run.
I have noted many instances of reports in this forum when queries have failed (and have had some such myself), and I feel that this shows poor appreciation by the submitter that not every system resembles his own.
Happy New Year to one and all!
Ken.
I disagree. If you want to run the code in your environment, you should take the appropriate steps based on the code to ensure that it runs. I ran the code in a sandbox database where I had to make appropriate changes, including commenting code as I ran each option to see what occurred.
The reason is the same as you mentioned, the person providing a QotD can't know how everyone's environment is setup. Do you have a AdventureWorks installed on your servers at work? I don't. Do you have your databases on your D: drive, or your backup files on the E: drive? There are so many possibilities that it isn't possible for a person to ensure that the code will work on everyones instance of SQL Server.
After answering the question, I tested the code.
First option, returned null.
Second option, an error.
Third option, correct result based on the table I used in the original modification for the table to query.
All of that confirmed my original answer of C.
Lynn Pettis
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Post #842026
Steve Eckhart
Steve Eckhart
Posted Tuesday, January 05, 2010 7:38 AM
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Like others, I answered A because it returned "the expected output": NULL. Option C returns an error:
Msg 208, Level 16, State 1, Line 1
Invalid object name 'dbo.Employees'.
I didn't put in the name of a valid table name in my database because that was not a part of the question. The question had the following as a "prequel" to all three of the queries:
declare @tablevariable varchar(100)
set @tablevariable = 'Employees'
So, for option C, I executed
declare @tablevariable varchar(100)
set @tablevariable = 'Employees'
DECLARE @sql nvarchar(4000), @params nvarchar(4000), @count int
SELECT @sql = N' SELECT @cnt = COUNT(*) FROM dbo.' + quotename(@tablevariable)
SELECT @params = N'@cnt int OUTPUT'
EXEC sp_executesql @sql, @params, @cnt = @count OUTPUT select @count
Therefore, option A returns the expected result (since the table variable is empty) and should be a correct answer.
Steve Eckhart
Post #842098
rustman
rustman
Posted Tuesday, January 05, 2010 7:46 AM
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My SQL2008 system seems to have trouble with the 'quotename' which encloses the tablename in []. Remove that with the dbo in front of the table name and Option C works fine.
Post #842103
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