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

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

需要按以下格式输出：

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 return 指定的结果集，您需要一个可以连接到 table 的行源，以生成 "duplicate" 行。

一种方法是创建日历类型 table 并使用您想要 return:

的所有可能日期的列表来填充

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table，得到"match".

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），您需要将它们转换为 DATE 数据类型以获得日期比较语义，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到 end_date 的日期范围

To display range of date from start date and end_date in select statement of MYSQL

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