T-SQL合并表

Question

我希望a + b到达C。如何合并A和B？

谢谢：）

表A

SELECT init, MIN(p.aarstal) AS startyear
FROM placering p
GROUP BY init
ORDER BY startyear

表B

SELECT init, MAX(p.aarstal) AS endyear
FROM placering p
GROUP BY init 
ORDER BY endyear

Answer 1

您只需在一个select中选择两个表达式：

select init, min(p.aarstal) as startyear, max(p.aarstal) as endyear
from placering p
group BY init
order by startyear

Answer 2

您只是在寻找这个吗？

SELECT init, min(p.aarstal) as startyear, max(p.aarstal) as endyear
FROM placering p
GROUP BY init
ORDER BY startyear, endyear

Answer 3

它们是同一张表，因此您只需要结合两个查询的逻辑即可。参见下面的示例。

SELECT 
  p.init, 
  min(p.aarstal) as startyear, 
  max(p.aarstal) as endyear
FROM placering p
GROUP BY init
ORDER BY startyear, endyear