MySQL stored procedure return null -


i have stored procedure out parameter (code):

select code = right(concat(repeat(0, 6), (select max(convert(code, int)) + 1 enterprises)), 6)

if exec it, return null value, if execute single query, works right. why?

rename parameter, try write (parameter name code_param) -

select   right(concat(repeat(0, 6), (select max(convert(code, int)) + 1 enterprises)), 6) code_param;

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