Question

大家好，

我有以下表格：

jobs_active：

| id | date_id    | job_id | result   |
|-------------------------------------|
| 1  | 2017-08-28 | 1      | failed   |
|-------------------------------------|
| 2  | 2017-08-28 | 2      | failed   |
|_____________________________________|

jobs_history：

| id | job_id | date_id    | job_id | result   |
|----------------------------------------------|
| 1  | 1      | 2017-08-27 | 1      | failed   |
|----------------------------------------------|
| 2  | 1      | 2017-08-26 | 1      | success  |
|----------------------------------------------|
| 3  | 2      | 2017-08-27 | 2      | failed   |
|----------------------------------------------|
| 4  | 2      | 2017-08-26 | 2      | failed   |
|______________________________________________|

我想得到这个结果：

                             (2017-08-28)| (2017-08-27)    | (2017-08-26)


| id | date_id    | job_id | result_now  | result_lastDay1 | result_lastDay2 |
|----------------------------------------------------------------------------|
| 1  | 2017-08-27 | 1      | failed      | failed          | success         |
|----------------------------------------------------------------------------|
| 2  | 2017-08-26 | 2      | failed      | failed          | failed          |
|____________________________________________________________________________|

“result_lastDayN”列应该是动态的。因此，如果需要，我可以选择最后10天。

我已经尝试过加入和联盟，但我没有让它发挥作用。有没有人知道这是否可能？

Answer 1

你试过子查询吗？

select ja.*,
(select result from jobs_history jh where job_id = ja.id and jh.date = j.date - INTERVAL 1 DAY) result_lastDay1,
(select result from jobs_history jh where job_id = ja.id and jh.date = j.date - INTERVAL 2 DAY) result_lastDay2
 from 
jobs_active ja

MySQL一个来自2个表的结果

1 个答案: