create user myshares identified by myshares; grant all privileges to myshares; connect myshares/myshares create table users ( userid number(5) primary key, email varchar2(50) unique, pwd varchar2(10) not null ); create table shares ( stockcode varchar2(10) primary key, company varchar2(50) unique, sharevalue number(10,2) ); create table user_shares ( userid number(5) references users(userid), stockcode varchar2(10) references shares(stockcode), noshares number(5), primary key (userid,stockcode) ); create sequence userid_seq start with 1 increment by 1 nocache; insert into users values(userid_seq.nextval, 'a@a.com','a'); insert into users values(userid_seq.nextval, 'b@b.com','b'); insert into shares values('infosys','InfoSys Ltd',2000); insert into shares values('tcs','Tata Consultancy services',1400); insert into shares values('sbi','State Bank Of India',600);