column name work as a case insenstive

we are facing below issue where lower_case_table_names set it to 1. for Example ::we have a table 'x' which has 3 or n column, and column col1 is a char(1) type and that is our unique key as well. while inserting the data in table ' insert ..... value(chr(97),...,...) it got inserted successfully and when i insert another data ' insert ..... value(chr(65),...,...)

it gives an error "duplicate entry for 'A'" ERROR 1062 (23000): Duplicate entry 'A-0' for key