C# 在一个字段的基础上获取记录,该字段应该是不同的
我有类似的疑问C# 在一个字段的基础上获取记录,该字段应该是不同的,c#,asp.net,sql,sql-server,database,C#,Asp.net,Sql,Sql Server,Database,我有类似的疑问 SELECT distinct(a.CreatedOn), a.id AS ID , u1.FirstName CreatedByFirstName, u1.LastName FROM AuditDetail a LEFT JOIN UserProfile u1 ON a.CreatedBy = u1.UserProfileID LEFT JOIN UserProfile u2 ON a.UpdatedBy = u2.UserPr
SELECT distinct(a.CreatedOn),
a.id AS ID ,
u1.FirstName CreatedByFirstName,
u1.LastName
FROM AuditDetail a
LEFT JOIN UserProfile u1 ON a.CreatedBy = u1.UserProfileID
LEFT JOIN UserProfile u2 ON a.UpdatedBy = u2.UserProfileID
这显示了所有的记录。每个记录中也会重复使用不同的createdon,因为所有记录都会提交。我希望如果createdon在所有记录中都是相同的,那么它的第一个记录或单个记录不应该全部出现。我错在哪里
您可以使用
排名功能
,例如行数()
,它为每个组的每条记录提供排名
WITH recordList
AS
(
SELECT a.CreatedOn,
a.id as ID ,
u1.FirstName CreatedByFirstName,
u1.LastName,
ROW_NUMBER() OVER(PARTITION BY a.CreatedOn ORDER BY a.CreatedOn) rn
FROM AuditDetail a
left join UserProfile u1
on a.CreatedBy = u1.UserProfileID
left join UserProfile u2
on a.UpdatedBy = u2.UserProfileID
)
SELECT CreatedOn,
ID,
CreatedByFirstName,
LastName
FROM recordList
WHERE rn = 1
试试这个
可能会帮助您,使用子查询
SELECT a.CreatedOn,
a.id AS ID ,
u1.FirstName CreatedByFirstName,
u1.LastName
FROM AuditDetail a
LEFT JOIN UserProfile u1 ON a.CreatedBy = u1.UserProfileID LEFT joinUserProfileu2 ON a.UpdatedBy = u2.UserProfileID
WHERE a.CreatedOn IN
(SELECT DISTINCT CreatedOn
FROM AuditDetail)
你能提供你从这份声明中得到的样本结果吗?检查daigram!与上图相同的结果显示@“ID”不同,它应该返回重复的createdon。如果您想要一个createdon记录,您应该去掉a.id选择。