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  SQL Server Tips by Gama and Naughter



Nvarchar stores variable length Unicode data. This example is very obvious:


DECLARE @b nvarchar(10)

SET @b='abc'

select DATALENGTH(@b), LEN(@b)



6     3




Bigint can store numbers between -2^63 and 2^63-1, that is -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807.


Int can store numbers between -2^31 and 2^31 - 1, that is -2,147,483,648 to 2,147,483,647.


Smallint can store numbers between -2^15 and 2^15 - 1, that is -32,768 to 32,767


Tinyint can store numbers between 0 and 255.



Bit can be either 1 or 0. Any numeric value can be attributed to a bit variable turning it into 0 if the original value was 0, otherwise 1.


The above book excerpt is from:

Super SQL Server Systems
Turbocharge Database Performance with C++ External Procedures

ISBN: 0-9761573-2-2
Joseph Gama, P. J. Naughter


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