sql - stored procedure with isnull(expression, replacement) return nothing -


i have stored procedure accepts parameter , return tuple matching values. if no parameter passed, return every tuple in table

create procedure getscore (     @cliniccode varchar = null, ) begin     select * mytable     cliniccode = isnull(@cliniccode, cliniccode) end

so executte it

exec getscore exec getscore 'psh'

both of them return no tuple. did try select * mytable, , returns tuples. not sure why statement ... isnull(expression, replacement) messed up

you need change declaration of 

@cliniccode varchar = null,

to actual size require.

so like

@cliniccode varchar(50) = null,

the reason that

@cliniccode varchar

is same 

@cliniccode varchar(1)

which casts field isnull(@cliniccode, cliniccode) first letter of cliniccode

have @ example

sql fiddle demo


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