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create table Clients (
ClientId int primary key auto_increment,
ClientFirstName varchar(64),
ClientLastName varchar(64),
ClientDoB date,
Occupation varchar(64)
);
insert into Clients (ClientFirstName, ClientLastName, Occupation) values
('John', 'Smith', 'bookkeper'),
('Sarah', 'Connor', 'doctor');
create table Borrower (
BorrowId int primary key auto_increment,
ClientId int,
BookId int,
BorrowDate date,
index(ClientId),
foreign key (ClientId) references Clients(ClientId)
);
insert into Borrower (ClientId, BookId) values
(1, 1), (1, 2), (1, 3),
(2, 1), (2, 7);
SELECT Occupation, count(*) BooksBorrowed
FROM Borrower
NATURAL LEFT JOIN Clients
GROUP BY Occupation;
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