Question

要跟踪订单，我需要订单表中的订单ID，并检查订单表，该订单是在特定日期范围内进行的。使用以下查询我可以获得id，但它也将返回id 3，这也是不需要的。

示例：请参阅orderdates表。 id 3的第一个日期与id 2的最后日期重叠。

如果ID的第一个日期与其他ID的最后日期重叠或甚至是否可能，我如何更改不返回ID的查询？

SELECT id
FROM orders
WHERE id in(
SELECT id
FROM orderdates
WHERE 
orderdate BETWEEN '2017-06-01' AND '2017-06-30'
GROUP BY id);

orders  
id  sent
1   1
2   1
3   1

orderdates  
id  orderdate
1   2017-6-10
1   2017-6-11
1   2017-6-12
1   2017-6-13
2   2017-6-14
2   2017-6-15
2   2017-6-16
2   2017-6-17 <--- Last date of id 2
3   2017-6-17 <--- First date of id 3
3   2017-6-18
3   2017-6-19
3   2017-6-20

Answer 1

也许我将每个id的最小日期与每个id的最大日期进行比较

select u.*
from t u
where u.id not in
(
select z.id
from
(
select s.*,t.id tid,t.mindt tmindt,t.maxdt tmaxdt
from
(
select id, min(dt) mindt,max(dt) maxdt
from t 
group by id
order by id
) s
join 
(select id, min(dt) mindt,max(dt) maxdt
from t 
group by id
order by id
) t on 
    t.id <> s.id and 
    t.maxdt = s.mindt
) z
) 
order by u.id,u.dt

鉴于此

truncate table t;
insert into t values
(1,'2017-01-01'),(1,'2017-01-02'),
(2,'2017-01-03'),(2,'2017-01-04'),
(3,'2017-01-04')

结果

+------+------------+
| id   | dt         |
+------+------------+
|    1 | 2017-01-01 |
|    1 | 2017-01-02 |
|    2 | 2017-01-03 |
|    2 | 2017-01-04 |
+------+------------+
4 rows in set (0.00 sec)

鉴于此

truncate table t;
insert into t values
(1,'2017-01-01'),(1,'2017-01-02'),
(2,'2017-01-03'),(2,'2017-01-04'),
(3,'2017-01-04'),
(4,'2017-01-04'),(4,'2017-01-06');

结果

+------+------------+
| id   | dt         |
+------+------------+
|    1 | 2017-01-01 |
|    1 | 2017-01-02 |
|    2 | 2017-01-03 |
|    2 | 2017-01-04 |
+------+------------+
4 rows in set (0.00 sec)

鉴于

truncate table t;
insert into t values
(1,'2017-01-01'),(1,'2017-01-02'),
(2,'2017-01-03'),(2,'2017-01-04'),
(3,'2017-01-04'),
(4,'2017-01-05'),(4,'2017-01-06');

结果

+------+------------+
| id   | dt         |
+------+------------+
|    1 | 2017-01-01 |
|    1 | 2017-01-02 |
|    2 | 2017-01-03 |
|    2 | 2017-01-04 |
|    4 | 2017-01-05 |
|    4 | 2017-01-06 |
+------+------------+
6 rows in set (0.02 sec)

Mysql查询，仅返回记录哪些日期与其他记录的日期不重叠

1 个答案: