在LINQ中轉換SQL查詢並選擇計數

Question

我有2個SQL查詢我嘗試使用linqer轉換但沒有結果。查詢是這樣的：

select distinct a.DOCID, 
(select dcrea from mstdocs where DOCID = a.docid and vtype = 'table') DOC_DATE, 
(select dcrea from mstdocs where DOCID= a.docid and vtype = 'read' and VTAID = '2') Read_DATE 
from mstdocs a, mstdocstats b 
where a.docid = b.docid 
and a.vtaid = '2' 
and a.vtype = 'read' 
and DATEPART(mm,a.DCREA) = '06' 
and DATEPART(yyyy,a.DCREA) = '2016' 
and a.docid in 
(
select distinct a.docid 
from mstdocs a, mstdocstats b 
where a.docid = b.docid 
and a.vtype = 'table' 
and DATEPART(mm,a.DCREA) = '06' 
and DATEPART(yyyy,a.DCREA) = '2016' 
) 


select distinct a.docid 
from mstdocs a, mstdocstats b 
where a.docid = b.docid 
and (select count(*) from mstdocs docs where docs.DOCID = a.docid and docs.vtaid = '2') = 1 

我有嘗試轉換第一個查詢分成兩個部分

• 風險價值=（從b在mstdocstats 在mstdocs上a.docid加入等於B。的docID 其中a.vtype.Equals（ 「表」） & & a.DCREA.Month == '06' & & a.DCREA.Year == '2016' 選擇a.docid）.Distinct（）。ToList （）;

• 變種B =（從步驟b中mstdocstats 加入在上a.docid mstdocs等於b.docid 其中a.Contains（a.docid） 選擇新的{ 文檔ID = a.docid， DOC_DATE = （從mstdocs其中a.docid == mstdoc.docid & & mstdoc.vtype == 「表」 mstdoc選擇
  mstdoc.DCREA），
  Read_DATE =（從mstdocs mstdoc其中a.docid == mstdoc.docid & & mstdoc.vtype ==「讀」& &
  mstdoc.vtaid ==「2」select mstdoc.DCREA）}）。ToList（）;

但變得錯誤，有人可以告訴我哪裏是錯誤嗎？

感謝任何答案...

Answer 1

我假設DCREA是Datetime ..第一個查詢最初得到的，在2016年6月日期間隔落在子集，並從該得到的「讀子讀「 ...

var qry_1 = (from a in (
       from a in mstdocs 
       join b in mstdocstats on a.docid equals b.docid 
       where a.DCREA.Month == 6 && a.DCREA.Year == 2016 
       select a 
      )join b in mstdocstats on a.docid equals b.docid 
      where a.vtaid == "2" && a.vtype == "read" 
      select new { 
         DOCID = a.Name, 
         Read_DATE = a.DCREA, 
         DOC_DATE = (from mstdoc in mstdocs where a.docid == mstdoc.docid && mstdoc.vtype == "table" select mstdoc.DCREA) 
        } 
      ).Distinct().ToList(); 




var qry_2 = (from a in 
      (from a in mstdocs 
       where a.vtaid == "2" 
       group a by a.docid into GroupMstdocs 
       where GroupMstdocs.Count() == 1 
       select new { docid = GroupMstdocs.Key } 
      ) join b in mstdocstats on a.docid equals b.docid 
       select a.docid 
      ).Distinct().ToList();