Question

表“科目”包含列：

sub_date, sub_content, student_id
2014-10-03, english, 1
2014-10-09, maths, 2
2014-10-11, biology, 1

和桌面游戏包含列：

game_date, game_content, student_id
2014-10-05, Hockey, 1
2014-10-18, Tennis, 1
2014-10-20, Cricket, 2

我希望按日期显示student_id 1个订单的所有详细信息（同时考虑sub_date和game_date

Date, Topic
2014-10-03, english
2014-10-05, Hockey
2014-10-11, biology
2014-10-18, Tennis

请帮忙

Answer 1

你可以试试这个：

select sub_date,sub_content from subjects where student_id = 1
UNION
select game_date,topic from games where student_id = 1

Answer 2

你可以试试这个（即使听起来不是一个好主意）：

SELECT tmp.sub_date AS Date,tmp.sub_content AS Topic 
FROM (
    SELECT sub_date,sub_content,student_id FROM subjects 
    UNION SELECT game_date,game_content,student_id FROM games
) tmp 
WHERE tmp.student_id = 1 ORDER BY tmp.sub_date;

来自两个没有连接的表的数据

2 个答案: