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Identity Crisis: Attack of the Clone


Identity Crisis: Attack of the Clone

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srkrell
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Excellent Question and thorough explanation.
Thanks!
WayneS
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Tom.Thomson (5/11/2011)
Nice question.

One niggle: asking people to assume that a schema is valid when a table doesn't have a primary key may encourage a very bad habit if some of your audience don't know any better. Maybe "pretend" would have been a better choice of word than "assume".


Tom, I think it was referring to the schema "Playground", which the table was created in.

Wayne
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WayneS
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Good question - thanks!

Wayne
Microsoft Certified Master: SQL Server 2008
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If you can't explain to another person how the code that you're copying from the internet works, then DON'T USE IT on a production system! After all, you will be the one supporting it!
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CROSS-TABS and PIVOT tables Part 1 & Part 2, Using APPLY Part 1 & Part 2, Splitting Delimited Strings

SanDroid
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steven.chester (5/11/2011)
What's funny is that I couldn't pick my first answer: a syntax error. There's a superfluous comma in the DDL for the table.

That comma does not generate any error when the code is executed as listed in the QOTD. :-P
Of course you would need to execute this command before you execute the QOTD SQL to test that. Don't forget to replace parameters.

CREATE SCHEMA PLAYGROUND AUTHORIZATION <Your User Name, sysname, DBuser>
GO


toddasd
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mtassin (5/11/2011)...
At that point, just call the bloody thing a primary key.

So I see INT IDENTITY(1,1) and these days I assume PRIMARY KEY is stuck on the end of it.

Then I misread the answer that said it was a violation of the IDENTITY constraint. Which I know isn't a constraint... I was just rushed because I have a meeting in 10 min. Smile

Oops.


Same here Mark. After seeing Identity and primary key together for years, my mind automatically puts them together. I need to start paying atte...ooh, look, ice cream!

Good question.

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FargoUT
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WayneS (5/11/2011)
Tom.Thomson (5/11/2011)
Nice question.

One niggle: asking people to assume that a schema is valid when a table doesn't have a primary key may encourage a very bad habit if some of your audience don't know any better. Maybe "pretend" would have been a better choice of word than "assume".


Tom, I think it was referring to the schema "Playground", which the table was created in.


I think he was implying that the table's schema (not the Playground schema -- confused yet?) is not appropriate since there is no primary key or unique identifier. Someone may read the question and assume the table's structure is good practice when it is not.
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nice and straight forward - thanks



Jason AKA CirqueDeSQLeil
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Peter Trast
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Almost got it wrong until I remembered that IDENTITY does not have to be UNIQUE :-) I just WANT it to be... made me read carefully. That's why I think this is a great question.

Peter Trast
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Tom Thomson
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WayneS (5/11/2011)
Tom.Thomson (5/11/2011)
Nice question.

One niggle: asking people to assume that a schema is valid when a table doesn't have a primary key may encourage a very bad habit if some of your audience don't know any better. Maybe "pretend" would have been a better choice of word than "assume".


Tom, I think it was referring to the schema "Playground", which the table was created in.

Ah, yes, probably. My mistake. I find it hard at times to remember that MS misuses this particular term so horribly, and my reaction Alien was as it was because I interpreted "schema" as "schema" rather than as what MS calls "schema". Must remember loony MS terminology in future Sad.

Tom

Surii
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Excellent question.
Go


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