本章主要講解內連線，inner join子句將乙個表中的行於其他標表中的行進行匹配，並允許從兩個表中查詢包含列的行紀錄，一般出現在from子句之後。
desc employee;
desc department;
select e.fname, e.lname, d.name from employee e join department d;
select e.fname, e.lname, d.name from employee e join department d on e.dept_id = d.dept_id;
select e.fname, e.lname, d.name from employee e inner join department d on e.dept_id = d.dept_id;
select e.fname, e.lname, d.name from employee e inner join department d using (dept_id);
select e.fname, e.lname, d.name from employee e, department d where e.dept_id = d.dept_id;
select a.account_id, a.cust_id, a.open_date, a.product_cd from account a, branch b, employee e
where a.open_emp_id = e.emp_id
and e.start_date < '2007-01-01'
and e.assigned_branch_id = b.branch_id
and (e.title = 'teller' or e.title = 'head teller')
and b.name = 'woburn branch';
select a.account_id, a.cust_id, a.open_date, a.product_cd from account a inner join employee e
on a.open_emp_id = e.emp_id
inner join branch b
on e.assigned_branch_id = b.branch_id
where e.start_date < '2007-01-01'
and (e.title = 'teller' or e.title = 'head teller')
and b.name = 'woburn branch';
select a.account_id, c.fed_id from account a inner join customer c
on a.cust_id = c.cust_id where c.cust_type_cd = 'b';
select a.account_id, c.fed_id, e.fname, e.lname from account a inner join customer c
on a.cust_id = c.cust_id
inner join employee e
on a.open_emp_id = e.emp_id
where c.cust_type_cd = 'b';
select a.account_id, c.fed_id, e.fname, e.lname from customer c inner join account a
on e.emp_id = a.open_emp_id
inner join customer c
on a.cust_id = c.cust_id
where c.cust_type_cd = 'b';
select emp_id, assigned_branch_id from employee
where start_date < '2007-01-01'
and (title = 'teller' or title = 'head teller');
select branch_id from branch
where name = 'woburn branch';
select a.account_id, e.emp_id, b_a.name open_branch, b_e.name emo_branch
from account a inner join branch b_a
on a.open_branch_id = b_a.branch_id
inner join employee e
on a.open_emp_id = e.emp_id
inner join branch b_e
on e.assigned_branch_id = b_e.branch_id
where a.product_cd = 'chk';
select e.fname, e.lname, e_mgr.fname mgr_fname, e_mgr.lname mgr_lname
from employee e inner join employee e_mgr
on e.superior_emp_id = e_mgr.emp_id;
select e1.fname, e1.lname, 'vs' vs, e2.fname, e2.lname
from employee e1 inner join employee e2
on e1.emp_id != e2.emp_id
where e1.title = 'teller' and e2.title = 'teller';
select e1.fname, e1.lname, 'vs' vs, e2.fname, e2.lname
from employee e1 inner join employee e2
on e1.emp_id < e2.emp_id
where e1.title = 'teller' and e2.title = 'teller';
select a.account_id, a.product_cd, c.fed_id from account a inner join customer c
on a.cust_id = c.cust_id
where c.cust_type_cd = 'b';
select a.account_id, a.product_cd, c.fed_id from account a inner join customer c
on a.cust_id = c.cust_id
and c.cust_type_cd = 'b';
select a.account_id, a.product_cd, c.fed_id from account a inner join customer c
where a.account_id = c.cust_id
and c.cust_type_cd = 'b';
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