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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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