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T-SQL 2012 #2


T-SQL 2012 #2

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bitbucket-25253
bitbucket-25253
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Comments posted to this topic are about the item T-SQL 2012 #2

If everything seems to be going well, you have obviously overlooked something.

Ron

Please help us, help you -before posting a question please read

Before posting a performance problem please read
Tom Thomson
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Nice clear straightforward question.
Good to see a question on this new feature.

Interestingly, there's an error on the BoL page: it says the CHOOSE function
BoL
Returns the data type with the highest precedence from the set of types passed to the function

The first argument is an integer, which has a higher type precedence than any character type, but if it really was going to return an int we would have string to int conversion errors here. BoL should instead say that the return type is highest precedence type of the arguments other than the first.

Tom

bitbucket-25253
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L' Eomot Inversé (1/12/2013)
Nice clear straightforward question.
Good to see a question on this new feature.

Interestingly, there's an error on the BoL page: it says the CHOOSE function
BoL
Returns the data type with the highest precedence from the set of types passed to the function

The first argument is an integer, which has a higher type precedence than any character type, but if it really was going to return an int we would have string to int conversion errors here. BoL should instead say that the return type is highest precedence type of the arguments other than the first.


From the supporting link in the question
CHOOSE acts like an index into an array, where the array is composed of the arguments that follow the index argument. The index argument determines which of the following values will be returned.



If everything seems to be going well, you have obviously overlooked something.

Ron

Please help us, help you -before posting a question please read

Before posting a performance problem please read
SQLRNNR
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Glad we have this feature added.



Jason AKA CirqueDeSQLeil
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Tom Thomson
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bitbucket-25253 (1/12/2013)
L' Eomot Inversé (1/12/2013)
Nice clear straightforward question.
Good to see a question on this new feature.

Interestingly, there's an error on the BoL page: it says the CHOOSE function
BoL
Returns the data type with the highest precedence from the set of types passed to the function

The first argument is an integer, which has a higher type precedence than any character type, but if it really was going to return an int we would have string to int conversion errors here. BoL should instead say that the return type is highest precedence type of the arguments other than the first.


From the supporting link in the question
CHOOSE acts like an index into an array, where the array is composed of the arguments that follow the index argument. The index argument determines which of the following values will be returned.


Yes, it says that. But that says nothing about the type returned, it's about which value is selected before any necessary type conversion is done. The same page contains the incorrect statement that I quoted, which says nothing about which value is selected, only about which type it is to be converted to (which it gets wrong).

Tom

Lokesh Vij
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Wow.. Thanks Ron for another one on SS2012 :-)

~ Lokesh Vij

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demonfox
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Lokesh Vij (1/13/2013)
Wow.. Thanks Ron for another one on SS2012 :-)


+1
Thanks for the question..

~ demonfox
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Stewart "Arturius" Campbell
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Interesting question, thanks Ron

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sqlnaive
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Thanks a lot for this question. Got to know about CHOOSE function. Very helpful. :-)
Koen Verbeeck
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Great question about a new 2012 feature. Thanks Ron!

(and thanks for including me ;-))


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