Question

我是SQL的新手。我有一个包含44列的5000条记录表。我需要有一个该表的子集，其中包含10个列以及对特定列（NationalCode）具有唯一值的所有行。

换句话说，此子集应显示所有唯一身份，并忽略具有重复NationalCode的行。

我知道下面的查询是错误的但是正确的形式是什么？

insert into Patient(NationalID, P_FirstName, P_LastName, P_FatherName, Gender, P_Age, P_AgeGroup, P_MaritalStatus)
    select  
        P_NationalCode, P_FirstName, P_LastName, 
        P_FatherName, FullDateAlternateKey, P_Age, P_AgeGroup, 
        P_MaritalStatus
    from 
        OriginalData 
    where 
        P_NationalCode in (select distinct P_NationalCode
                           from OriginalData)

任何帮助都将不胜感激。

Answer 1

试试这个

insert into Patient(NationalID, P_FirstName, P_LastName, P_FatherName, Gender, P_Age, P_AgeGroup, P_MaritalStatus)
select  
    P_NationalCode, P_FirstName, P_LastName, 
    P_FatherName, FullDateAlternateKey, P_Age, P_AgeGroup, 
    P_MaritalStatus
from 
    (select P_NationalCode, P_FirstName, P_LastName, 
    P_FatherName, FullDateAlternateKey, P_Age, P_AgeGroup, 
    P_MaritalStatus ,row_number() over(partition by P_NationalCode  order by P_NationalCode) as rowNumber from OriginalData
   ) data
where 
   rowNumber=1

表的子集，对SQL中的特定列具有唯一值

1 个答案: