使用来自不同表的数据填充和更新表

My site allows for a user to search for a term which returns a table of associated songs. When the "Add Track" button in a particular row is clicked after the search, the respective track name and trackId are added to the table "playlist". The problem I am having is that once "Add Track" is clicked within a different row, the data from that row is not added to the "playlist" table, but rather it just replaces the previous information. I need to be able to generate a cumulative table. Any help would be great and thanks in advance!My site allows for a user to search for a term