Question

说我有一个这样的表：

member  start_year  end_year
John    2013        2017

如何生成

member  year
John    2013
John    2014
John    2015
John    2016
John    2017

在SQL中？

Answer 1

典型的解决方案涉及递归CTE。首先，首先选择所有成员，然后递归UNION ALL，直到结束。

WITH cte
AS
(
SELECT t.member,
       t.start_year year
       FROM elbat t
UNION ALL
SELECT t.member,
       c.year + 1
       FROM cte c
            INNER JOIN elbat t
                       ON t.member = c.member
       WHERE c.year + 1 <= t.end_year
)
SELECT *
       FROM cte;

db<>fiddle

根据开始和结束数字生成行？

1 个答案: