[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
如何將其轉換為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
};
我得到這個錯誤
RemarkPeopleNumber = g.Select(m => m.MemberId).Distinct()。Count(),//錯誤
使用ASP.NET Core MVC 2.1 + EF Core 2.1 + MSSQL
也許,如果您將查詢分解成多個部分,它將得到更好的處理? 使用我的SQL到LINQ食譜,我可以這樣轉換您的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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