我有以下sql语句可以按需要/期望工作.不过,我想把它翻译成一个LINQ语句(Lambda ??),以便它能与我的DAL的其余部分相匹配.但是我看不出如何在LINQ中模拟Rank().
我发布在这里的原因,这可能是错误的,是看看有没有人可以替代Rank()语句,以便我可以把它切换.或者,如果有一种方式来表示LINQ中的Rank(),那也将不胜感激.
USE CMO
SELECT vp.[PersonID] AS [PersonId],ce.[EnrollmentID],vp.[FirstName],vp.[LastName],ce.[EnrollmentDate],ce.[DisenrollmentDate],wh.WorkerCategory
FROM [dbo].[vwPersonInfo] AS vp
INNER JOIN
(
[dbo].[tblCMOEnrollment] AS ce
LEFT OUTER JOIN
(
SELECT *,RANK()OVER(PARTITION BY EnrollmentID ORDER BY CASE WHEN EndDate IS NULL THEN 1 ELSE 2 END,EndDate DESC,StartDate DESC) AS whrank
FROM [dbo].[tblWorkerHistory]
WHERE WorkerCategory = 2
) AS wh
ON ce.[EnrollmentID] = wh.[EnrollmentID] AND wh.whrank = 1
)
ON vp.[PersonID] = ce.[ClientID]
WHERE (vp.LastName NOT IN ('Client','Orientation','Real','Training','Matrix','Second','Not'))
AND (
(wh.[EndDate] <= GETDATE())
OR wh.WorkerCategory IS NULL
)
AND (
(ce.[DisenrollmentDate] IS NULL)
OR (ce.[DisenrollmentDate] >= GetDate())
)
解决方法
这是一个示例,显示如何模拟Linq中的Rank()：
var q = from s in class.student
orderby s.Age descending
select new {
Name = s.name,Rank = (from o in class.student
where o.mark > s.mark
select o).Count() + 1
};
