获取日期和空之间的数据答案

【问题标题】：Get data between dates and null获取日期和空之间的数据
【发布时间】：2015-05-15 20:44:16
【问题描述】：

我必须获取客户的正确数据，这些数据可能已经过时，而不是最新数据。

表格：

Customer
+---------------------------+---------------+------+-----+---------+
| Field                     | Type          | Null | Key | Default |
+---------------------------+---------------+------+-----+---------+
| customer_id               | int(11)       | NO   | PRI | NULL    |
| customer_data             | varchar(255)  | NO   |     | NULL    |
| customer_valid_from       | datetime      | NO   |     | NULL    |
| customer_valid_till       | datetime      | YES  |     | NULL    |
+---------------------------+---------------+------+-----+---------+

Address
+---------------------------+---------------+------+-----+---------+
| Field                     | Type          | Null | Key | Default |
+---------------------------+---------------+------+-----+---------+
| address_id                | int(11)       | NO   | PRI | NULL    |
| address_street            | varchar(255)  | NO   |     | NULL    |
| address_valid_from        | datetime      | NO   |     | NULL    |
| address_valid_till        | datetime      | YES  |     | NULL    |
| customer_id               | int(11)       | NO   |     | NULL    |
+---------------------------+---------------+------+-----+---------+

Details
+---------------------------+---------------+------+-----+---------+
| Field                     | Type          | Null | Key | Default |
+---------------------------+---------------+------+-----+---------+
| detail_id                 | int(11)       | NO   | PRI | NULL    |
| detail_street             | varchar(255)  | NO   |     | NULL    |
| detail_valid_from         | datetime      | NO   |     | NULL    |
| detail_valid_till         | datetime      | YES  |     | NULL    |
| customer_id               | int(11)       | NO   |     | NULL    |
+---------------------------+---------------+------+-----+---------+

一开始我得到了一个日期和 customer_id。现在我想选择所有数据，这些数据与在日期给定 customer_id 的客户有关，这也是给定的。

我现在的 SQL 是这样的：

SELECT customer.*,address.*,details.*
FROM customer
JOIN address
ON address.customer_id = customer.customer_id
JOIN details
ON details.customer.customer_id = customer.customer.id
WHERE customer.customer_valid_from <= givenDate
AND customer.customer_valid_till >= givenDate
AND address.address_valid_from <= givenDate
AND address.address_valid_till >= givenDate
AND details.details_valid_from <= givenDate
AND details.details_valid_till >= givenDate
customer.customer_id = givenID;

在我看来，缺少一部分。如果一条记录匹配 valid_from

我考虑过 IF 或 CASE 子句，但我对 MySQL 的体验并不令人满意。

【问题讨论】：

标签： mysql date join

【解决方案1】：

试试这个from 子句：

WHERE customer.customer_valid_from <= givenDate AND
      (customer.customer_valid_till >= givenDate OR
       customer.customer_valid_till IS NULL OR
       customer.customer_valid_till  = '0000-00-00 00:00:00'
      ) AND
      address.address_valid_from <= givenDate AND
      (address.address_valid_till >= givenDate OR
       address.address_valid_till IS NULL OR
       address.address_valid_till = '0000-00-00 00:00:00'
      ) AND
      details.details_valid_from <= givenDate AND
      (details.details_valid_till >= givenDate OR
       details.details_valid_till IS NULL OR
       details.details_valid_till = '0000-00-00 00:00:00'
      )

它只是添加了您似乎要求的逻辑。

【讨论】：

太棒了！那么括号中的部分是 IF 子句？
@Pero 。 . .括号中的部分实现了till日期可以满足三个条件中的任何一个的逻辑。 WHERE 与IF 不完全相同； WHERE 正在逐行过滤数据。

【解决方案2】：

SELECT customer.*,address.*,details.*
FROM customer
JOIN address
ON address.customer_id = customer.customer_id
JOIN details
ON details.customer.customer_id = customer.customer.id
WHERE customer.customer_valid_from <= givenDate
AND customer.customer_valid_till >= givenDate
AND address.address_valid_from <= givenDate
AND address.address_valid_till >= givenDate
AND details.details_valid_from <= givenDate
AND (details.details_valid_till >= givenDate OR details.details_valid_till IS NULL OR details.details_valid_till = '0000-00-00 00:00:00')
customer.customer_id = givenID;

【讨论】：