Question

从transactional_detail中选择*;

transaction_id  product_id  customer_id start_date  end_date
1               1           1           30-12-2014  01-01-2015

需要以下面给出的格式输出：

transaction_id  product_id  customer_id date
1               1           1           30-12-2014
1               1           1           31-12-2014
1               1           1           01-01-2015

请在MYSQL中提供SQL查询。

此致阿伦

Answer 1

$startDate = date("d-m-Y",strtotime($row['start_date']));

Answer 2

为了返回指定的结果集，您需要一个可以连接到表的行源，以生成＆＃34; duplicate＆＃34;行。

一种方法是创建并填充日历类型表，其中包含您要返回的所有可能日期的列表：

CREATE TABLE cal (dt DATE NOT NULL PRIMARY KEY) ENGINE=InnoDB;
INSERT INTO cal (dt) VALUES ('2010-01-01');
INSERT INTO cal (dt) SELECT dt + INTERVAL 1 DAY FROM cal ORDER BY dt;
INSERT INTO cal (dt) SELECT dt + INTERVAL 2 DAY FROM cal ORDER BY dt;
INSERT INTO cal (dt) SELECT dt + INTERVAL 4 DAY FROM cal ORDER BY dt;
INSERT INTO cal (dt) SELECT dt + INTERVAL 8 DAY FROM cal ORDER BY dt;
INSERT INTO cal (dt) SELECT dt + INTERVAL 16 DAY FROM cal ORDER BY dt;
INSERT INTO cal (dt) SELECT dt + INTERVAL 32 DAY FROM cal ORDER BY dt;
INSERT INTO cal (dt) SELECT dt + INTERVAL 64 DAY FROM cal ORDER BY dt;
INSERT INTO cal (dt) SELECT dt + INTERVAL 128 DAY FROM cal ORDER BY dt;
INSERT INTO cal (dt) SELECT dt + INTERVAL 256 DAY FROM cal ORDER BY dt;
INSERT INTO cal (dt) SELECT dt + INTERVAL 512 DAY FROM cal ORDER BY dt;
INSERT INTO cal (dt) SELECT dt + INTERVAL 1024 DAY FROM cal ORDER BY dt;
INSERT INTO cal (dt) SELECT dt + INTERVAL 2048 DAY FROM cal ORDER BY dt;
INSERT INTO cal (dt) SELECT dt + INTERVAL 4096 DAY FROM cal ORDER BY dt;

然后，在连接操作中引用该表，以获得＆＃34;匹配＆＃34;的所有dt值。

假设start_date和end_date列是DATE数据类型：

SELECT t.transaction_id
     , t.product_id
     , t.customer_id
     , c.dt
  FROM transactional_detail t
  JOIN cal c
    ON c.dt >= t.start_date
   AND c.dt <= t.end_date
 ORDER
    BY t.transaction_id
     , t.product_id
     , t.customer_id
     , c.dt

如果start_date和end_date是VARCHAR而不是DATE（这将是一个非常糟糕的设计选择），您需要将这些转换为DATE数据类型以获取日期比较语义，例如

    ON c.dt >= STR_TO_DATE(t.start_date,'%d-%m-%Y')
   AND c.dt <= STR_TO_DATE(t.end_date,'%d-%m-%Y')

在MYSQL的select语句中显示从开始日期和end_date开始的日期范围

2 个答案: