我有以下记录表:
Product | Colour | Quantity
---------------------------------------
Product A | Blue | 1
Product A | Red | 2
Product B | Green | 1
如何编写查询以返回以下内容?:
Product | Colour
---------------------------
Product A | Blue
Product A | Red
Product A | Red
Product B | Green
最佳答案
WITH numbers (rn) AS
(
SELECT MAX(quantity)
FROM product
UNION ALL
SELECT rn - 1
FROM numbers
WHERE rn > 1
)
SELECT p.*
FROM product p
JOIN numbers n
ON p.quantity >= n.rn
关于sql-server - 根据数量字段返回多个结果,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/5742482/