select user_id, session_id, unread_count from ard_call_unread_messages and user_id = #{userId } and session_id = #{sessionId} and unread_count = #{unreadCount} where user_id = #{userId } insert into ard_call_unread_messages user_id , session_id, unread_count, #{userId }, #{sessionId}, #{unreadCount}, update ard_call_unread_messages unread_count = #{unreadCount}, where user_id = #{userId } and session_id = #{sessionId} delete from ard_call_unread_messages where user_id = #{userId } delete from ard_call_unread_messages where user_id in #{userId } select * from ard_call_unread_messages where user_id = #{targetId} and session_id = #{sessionId} select COALESCE(SUM(unread_count), 0) from ard_call_unread_messages where user_id = #{userId } SELECT count(*) FROM ard_call_unread_messages WHERE user_id = #{userId } AND session_id = #{sessionId}