No-coupling database, 3-in-1 structure (or 3-layer structure)

# table 1: Object Readme Table People

Id:1,name:coolguy,adress:china

Id:2,name:baby,adress:china

# table 1: Object Readme table book

Id:1,title:a book,date:2016

Id:2,title:a bag,date:2016

id:3,title:apple,date:2016

# table 1: Object Readme Table Song

Id:1,name:rainbow

Id:2,name:the Sun

# table 2: Object association table People_book

Bookid:1,peopleid:1

Bookid:2,peopleid:1

Bookid:3,peopleid:2

# table 2: Object association table People_song

Songid:1,peopleid:2

Songid:2,peopleid:2

# Table 3: object contains table People_containsobject

Peopleid:1,table:people_book

Peopleid:2,table:people_book

Peopleid:2,table:people_song

No-coupling database, 3-in-1 structure (or 3-layer structure)