Mysql:(左外连接)
select p.FirstName FirstName,p.LastName LastName,a.City City,a.State State
from Person p
left join Address a
on p.PersonId = a.PersonId
Oracle:
SELECT FirstName, LastName, City, State
FROM Address, Person
where Person.PersonId = Address.PersonId(+)
对第二种oracle中的写法,类似于左外连接,(+)在哪个表就表示那个表是匹配表,而非基础表,而且(+)操作符只能出现在where子句中,不能与join语法同时使用,小白一个,若有问题,还望纠正错误。