🗊Презентация Music Shop

База данных «Музыкальный магазин»

Существующие таблицы create table Albums(album_id int, album_name varchar(20), singer_name varchar(20), primary key(album_id)) create table Singers(singer_id int, singer_name varchar(20), genre varchar(20), primary key(singer_id)) create table Sales(singer_id int, album_id int, primary key(singer_id, album_id), foreign key(album_id) references Albums, foreign key(singer_id) references Singers) alter table Sales add count_of_sold_albums int create table Shop(singer_id int, album_id int, available int, primary key(album_id), foreign key(album_id) references Albums) create table Studios(singer_id int, album_id int, label_name varchar(20), primary key(album_id), foreign key(album_id) references Albums) create table Singles(singer_id int, album_id int, single_name varchar(20), foreign key(singer_id) references Singers, foreign key(album_id) references Albums)

Существующие отношения 1:1 1:М М:М

М:М

М:М insert into Albums values(0011, 'Parachutes', 'Coldplay') insert into Albums values(0018, 'Ghost Stories', 'Coldplay') insert into Albums values(0022, 'Songs About Jane', 'Maroon 5') insert into Albums values(0027, 'Red Pill Blues', 'Maroon 5') insert into Albums values(0033, 'ANTI', 'Rihanna') insert into Albums values(0036, 'Loud', 'Rihanna') insert into Singers values(1100, 'Coldplay', 'Britpop-Rock') insert into Singers values(2200, 'Maroon 5', 'Pop-Rock') insert into Singers values(3300, 'Rihanna', 'R 'n’ B') insert into Sales values(1100, 0011, 100) insert into Sales values(1100, 0018, 80) insert into Sales values(2200, 0022, 200) insert into Sales values(2200, 0027, 180) insert into Sales values(3300, 0033, 230) insert into Sales values(3300, 0036, 210)

M:M

1:1

1:1 insert into Shop values(1100, 0011, 0) insert into Shop values(1100, 0018, 1) insert into Shop values(2200, 0022, 1) insert into Shop values(2200, 0027, 1) insert into Shop values(3300, 0033, 0) insert into Shop values(3300, 0036, 0) insert into Studios values(1100, 0011, 'Parlaphone') insert into Studios values(1100, 0018, 'Parlaphone') insert into Studios values(2200, 0022, 'Rumbo Recorders') insert into Studios values(2200, 0027, 'Conway Recording') insert into Studios values(3300, 0033, 'Conway Recording') insert into Studios values(3300, 0036, 'Parlaphone')

1:1

1:M

1:M insert into Singles values(1100, 0011, 'Yellow') insert into Singles values(1100, 0011, 'Sparks') insert into Singles values(2200, 0027, 'Girls Like You') insert into Singles values(2200, 0027, 'Wait') insert into Singles values(3300, 0033, 'Kiss it Better') insert into Singles values(3300, 0033, 'Love on The Brain')

1:M