id | artist | album -------------------- 01 | AA | aa 02 | AA | ab 03 | AA | ac 04 | BB | ba 05 | BB | bb 06 | BB | bc 07 | CC | ca 08 | DD | da 09 | DD | db -------------------- #### id | artist | album -------------------- 01 | AA | aa 02 | AA | ab 04 | BB | ba 05 | BB | bb 07 | CC | ca 08 | DD | da 09 | DD | db --------------------