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Sequences I


Sequences I

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sknox
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Comments posted to this topic are about the item Sequences I
Henrico Bekker
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got it wrong, as the correct answer wasn't listed.
your syntax is wrong in, sequence wouldn't be created to start of with...no increment value, no 'AS'..etc.

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Koen Verbeeck
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Henrico Bekker (4/16/2012)
got it wrong, as the correct answer wasn't listed.
your syntax is wrong in, sequence wouldn't be created to start of with...no increment value, no 'AS'..etc.


When I look at BOL I see the following:


CREATE SEQUENCE [schema_name . ] sequence_name
[ AS [ built_in_integer_type | user-defined_integer_type ] ]
[ START WITH <constant> ]
[ INCREMENT BY <constant> ]
[ { MINVALUE [ <constant> ] } | { NO MINVALUE } ]
[ { MAXVALUE [ <constant> ] } | { NO MAXVALUE } ]
[ CYCLE | { NO CYCLE } ]
[ { CACHE [ <constant> ] } | { NO CACHE } ]
[ ; ]


This means that everything is optional except the first line. MSDN also lists every default value for every line.

edit: Example E in the MSDN article is exactly the same as the QotD.

Anyway, awesome question. Really like the SQL Server 2012 questions!


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Interesting question, thanks...

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Carlo Romagnano
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I am curious to know how many developpers will use default value for "START WITH". In most cases will be a negative number.

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Koen Verbeeck
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Carlo Romagnano (4/17/2012)
I am curious to know how many developpers will use default value for "START WITH". In most cases will be a negative number.


They will all be negative, except for tinyint.
In most cases this shouldn't be a problem, unless you are using the sequence for generating surrogate keys and you have tied special meaning to some of them.

For example: 0 equals unknown, -1 equals not applicable.


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Koen Verbeeck (4/17/2012)
Carlo Romagnano (4/17/2012)
I am curious to know how many developpers will use default value for "START WITH". In most cases will be a negative number.


They will all be negative, except for tinyint.
In most cases this shouldn't be a problem, unless you are using the sequence for generating surrogate keys and you have tied special meaning to some of them.

For example: 0 equals unknown, -1 equals not applicable.


A number is a number, it doesn't matter if it is negative or positive,
but when you do maintanance on table or you should copy and paste values to/from excel, great numbers
are annoying.

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Iulian -207023
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Thanks for the question

Iulian
Michael Lysons
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Thanks for the question. I had to do a fair bit of digging to find out the answer.
Stuart Davies
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Good question today, thanks - took an educated guess and got it wrong.

Looks like I need more education.

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