SQL查询，以获取下一行的列为行的列，列的第二行为下一行

Question

我想编写一个SQL查询，以使下一行的列成为一行的列。测试示例如下

我想获得SQL查询以获得如下结果：

Answer 1

如果您所使用的版本支持LEAD，则可以使用select customer,orderdate,item, lead(orderdate,1) over(partition by customer order by date) as second_date, lead(item,1) over(partition by customer order by date) as second_item, lead(orderdate,2) over(partition by customer order by date) as third_date, lead(item,2) over(partition by customer order by date) as third_item from tbl 执行此操作。

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