Question

有没有办法合并两行数据并保存到SQL Server中的另一个表中？

示例，我有表A（Month，Category，AmountBought），包含4行数据：

- January, Student, 30
- January, Lecturer, 40
- February, Student, 10
- February, Lecturer, 20

我想合并两个具有相同月份的行并保存到表B（Month，AmountOfStudentBought，AmountOfLecturerBought）中，如下所示：

- January, 30, 40
- February, 10, 20

Answer 1

您可以使用聚合来进行旋转：

select month,
    sum(case when category = 'Student' then AmountBought else 0 end) as AmountOfStudentBought,
    sum(case when category = 'Lecturer' then AmountBought else 0 end) as AmountOfLecturerBought
from your_table
group by month;

SQL Server：合并来自同一个表的两行数据并保存到另一个表

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