[英]COUNT(DISTINCT *) in ef core 2.1
SELECT
e.EmpName,
me.RemarkNumber,
me.RemarkPeopleNumber
FROM
EmployeeInfo e
LEFT JOIN (
SELECT
COUNT(RemarkId) As RemarkNumber,
COUNT(DISTINCT MemberId) As RemarkPeopleNumber,
CreateUser
FROM
MemberRemark
WHERE
RemarkStatus = 0
GROUP BY
CreateUser
) AS me On e.EmpName = me.CreateUser
WHERE
BranchCode = '0000'
And [Status] = 0
How to convert it to LINQ? 如何将其转换为LINQ?
from e in db.EmployeeInfo
join me in (
from memberRemarks in db.MemberRemark
where memberRemarks.RemarkStatus == 0
group memberRemarks by new
{
memberRemarks.CreateUser,
} into g
select new
{
RemarkNumber = g.Count(),
RemarkPeopleNumber = g.Select(m => m.MemberId).Distinct().Count(),
g.Key.CreateUser
}
) on new { e.EmpName } equals new { EmpName = me.CreateUser } into meJoin
from me in meJoin.DefaultIfEmpty()
where e.BranchCode == "0000" & &e.Status == 0
select new
{
e.EmpName,
me.RemarkNumber,
me.RemarkPeopleNumber
};
I got this error 我得到这个错误
RemarkPeopleNumber = g.Select(m=>m.MemberId).Distinct().Count(), //error RemarkPeopleNumber = g.Select(m => m.MemberId).Distinct()。Count(),//错误
Using asp.net core mvc 2.1 + ef core 2.1 + mssql 使用ASP.NET Core MVC 2.1 + EF Core 2.1 + MSSQL
Perhaps if you broke the query up into pieces it would be handled better? 也许,如果您将查询分解成多个部分,它将得到更好的处理? Using my SQL to LINQ Recipe I would translate your SQL like this: 使用我的SQL到LINQ食谱,我可以这样转换您的SQL:
var ePart = from e in db.EmployeeInfo
where e.BranchCode == "0000" && e.Status == 0
select e;
var mrPart = from mr in db.MemberRemark
where mr.RemarkStatus == 0
group mr by mr.CreateUser into mrg
select new {
CreateUser = mrg.Key,
RemarkNumber = mrg.Count(),
RemarkPeopleNumber = mrg.Select(mr => mr.MemberId).Distinct().Count()
};
var ans = from e in ePart
join me in mrPart on e.EmpName equals me.CreateUser into mej
from me in mej
select new {
e.EmpName,
me.RemarkNumber,
me.RemarkPeopleNumber
};
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