Question

在下表中，一个帐户可以有多个州值（我这里没有提供除州字段以外的所有地址字段）

注意：Id字段的类型为varchar。

Account  	        Id	                State
------------------      ------------------  ----------------
A1000	                1000	                MI
A1000	                1001             	MI
A1001	                1002	                CA
A1001	                1003	                CA
A1002	                1004	                DE
A1002	                1005	                PS


I want to get output like below i.e. distinct of Account,State and its corresponding Top1 Id

 Account  	        Id	                State
------------------      ------------------  ----------------
A1000	                1000	                MI
A1001	                1002	                CA
A1002	                1004	                DE
A1002	                1005	                PS

直到现在我自己无法形成任何查询。任何人都可以知道如何实现这一目标。

Answer 1

您可以使用ROW_NUMBER：

;WITH CTE AS
(
    SELECT  *,
            RN = ROW_NUMBER() OVER(PARTITION BY Account, [State] ORDER BY Id)
    FROM dbo.YourTable
)
SELECT  Account,
        Id,
        [State]
FROM CTE
WHERE RN = 1;

Answer 2

你会得到最小的id：

select Account, min(Id) as Id, State
from yourtable
group by Account, State

Answer 3

select Account, MIN(Id), MIN(State)
FROM Account
GROUP BY Account

Answer 4

尝试使用此查询：

SELECT  T.Account,
        T.Id,
        T.[State]
FROM (

SELECT  *, RN = ROW_NUMBER() OVER(PARTITION BY Account, [State] ORDER BY Id)
    FROM dbo.YourTable ) AS T
WHERE T.RN = 1;

使用Id字段进行不同的查询

4 个答案: