<delete id="deleteStaffPosition" parameterType="java.util.List">
delete from staff_position where (POSITION_ID,STAFF_ID) in
<foreach item="item" index="index" collection="list" open="(" separator="," close=")">
(#{item.POSITION_ID,jdbcType=VARCHAR},#{item.STAFF_ID,jdbcType=VARCHAR})
</foreach>
</delete>