tsql - SQL Server decimal variable assignment? -


i'm trying write stored procedure , i'm getting unexpected divide 0 exceptions.

i've narrowed down following example.

why in world :

    declare @a decimal;     declare @b decimal;     declare @c decimal;      set @a = 4;     set @b = 9;     set @c = @a/@b       select @a/@b 'expected'     select @c 'wut'

result in this? 

    expected     ---------------------------------------     0.4444444444444444444      (1 row(s) affected)      wut     ---------------------------------------     0      (1 row(s) affected)

the problem haven't specified scale decimal type. msdn:

s (scale)

the number of decimal digits stored right of decimal point. number substracted p determine maximum number of digits left of decimal point. scale must value 0 through p. scale can specified if precision specified. the default scale 0; therefore, 0 <= s <= p.

so when try store @a/@b @c, fractional part gets truncated.

notice:

declare @a decimal(18, 3); declare @b decimal(18, 3); declare @c decimal(18, 3);  set @a = 4; set @b = 9; set @c = @a/@b   select @a/@b -- 0.44444444444444444444 select @c    -- 0.444

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