SQL64 找到每个人的任务
描述
有一个person表，主键是id，如下:
有一个任务(task)表如下，主键也是id，如下:
请你找到每个人的任务情况，并且输出出来，没有任务的也要输出，而且输出结果按照person的id升序排序，输出情况如下:
drop table if exists person;
drop table if exists task;
CREATE TABLE `person` (
`id` int(4) NOT NULL,
`name` varchar(32) NOT NULL,
PRIMARY KEY (`id`));
CREATE TABLE `task` (
`id` int(4) NOT NULL,
`person_id` int(4) NOT NULL,
`content` varchar(32) NOT NULL,
PRIMARY KEY (`id`));
INSERT INTO person VALUES
(1,'fh'),
(2,'tm');
INSERT INTO task VALUES
(1,2,'tm works well'),
(2,2,'tm works well');输出
1|fh|None
2|tm|tm works well
2|tm|tm works well
SELECT person.id,person.name,task.content FROM person
LEFT JOIN task ON
person.id = task.person_id
ORDER BY person_id