I want to find maximum number in sql server i have values with string part and integer part -


i have values sp-1,sp-2,sp-3.....sp-10,sp-11.

i have maximum number here in sql server 

select max(substring(supplementid,4,10)) max_num supreg

when execute code maximum number 9.

try:

select max(cast(substring(supplementid,4,10) int)) max_num supreg

or 

select max(cast(replace(supplementid,'sp-','') int)) max_num supreg

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