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select * from emp,dep;
select * from emp,dep where emp.dep_id = dep.id;
select * from emp,dep where emp.dep_id = dep.id and dep.name = "技術";
select * from emp inner join dep on emp.dep_id = dep.id;
select * from emp inner join dep on emp.dep_id = dep.id
where dep.name = "技術";
inner join 連接兩個表, where過濾條件,只取條件符合的
select * from emp left join dep on emp.dep_id = dep.id;
select * from emp right join dep on emp.dep_id = dep.id;
select * from emp left join dep on emp.dep_id = dep.id
union
select * from emp right join dep on emp.dep_id = dep.id;
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