MySQL JOIN两个表（联合）

Question

我有两个MySQL表

第一个是预订

+------------+--------------+---------+
| id         | contact_no   | date    | 
+------------+--------------+---------+
| p1         | 7898787946   | 15-06-05|
| p1         | 7897891562   | 15-06-05|
| p1         | 1546879585   | 15-06-07|
| p2         | 1789546528   | 15-06-07|
| p3         | 7894668265   | 15-06-07| 
+------------+--------------+---------+

第二个是设置

+------------+--------------+------+-----+
| id         | date         | time | max |
+------------+--------------+------+-----+
| p1         | 15-06-06     | 8.00 | 20  |
| p1         | 15-06-07     | 8.00 | 20  |
| p2         | 15-06-07     | 9.00 | 10  |
| p3         | 15-06-08     | 8.00 | 20  | 
+------------+--------------+------+-----+

我需要为特定的id（比如说p1）加入两个表，我想精确地生成这个表。 count是特定日期和ID的行数。 （例如，p1的15-06-05的计数为2）

+------------+--------------+------+-----+
| count      | date         | time | max |
+------------+--------------+------+-----+
| 2          | 15-06-05     | null | null|
| 0          | 15-06-06     | 8.00 | 20  |
| 1          | 15-06-07     | 8.00 | 20  |
+------------+--------------+------+-----+

什么是MySQL查询可用于生成此第三张表

我尝试了这个SELECT COUNT（booking.date）作为'count'，setup.time，booking.date，setup.max。从预订中LEFT JOIN在booking.date = setup.date和booking.id = setup.id和预订中进行设置。 id ='p1'GROUP BY booking.date ORDER BY booking.date ASC“

Answer 1

这样的事情，但我目前无法检查。 如果没有MySql full join这是很痛苦的：

SELECT COALESCE(id1, id2), COALESCE(date1, date2), COUNT(*), MAX(time), MAX(max)
FROM
    (SELECT b.id as id1, s.id as id2, b.date as date1, s.date as date2, s.time, s.max FROM booking b
     LEFT JOIN setup s on b.id = s.id and b.date = s.date
     WHERE b.id = 'p1'
     UNION
     SELECT b.id as id1, s.id as id2, b.date as date1, s.date as date2, s.time, s.max FROM booking b
     RIGHT JOIN setup s on b.id = s.id and b.date = s.date
     WHERE s.id = 'p1') t
GROUP BY COALESCE(id1, id2), COALESCE(date1, date2)