execute more than one sql query

Dear All, I need to execute two queries using radius in sql.conf. i tried to put two queries like this : in the file i have accounting_update_query_alt = "query_1" i made it accounting_update_query_alt = "query_1 ; query_2" but i got an error from MySql concerning the second section '; query_2' how can i do it ?? Thanks Amr el-Saeed