複数のテーブルを結合するLINQクエリを作成しています。結果セットで、最小日付と最大日付を組み合わせて表示する列を広告したいと思います[例: (20/3/2012 - 25/4/2012)]テーブルから。
日付を選択したいテーブル(多対多の関係を管理するテーブル)の構造は次のとおりです。
BookedAreaID int
AreaID int
LeasedDate datetime
InvoiceID int
これが私のLINQクエリです:
var selectedResults=
from InvoiceSet in Invoices
join BookedAreaSet in BookedAreas on InvoiceSet.InvoiceID equals BookedAreaSet.InvoiceID
join AreaSet in Areas on BookedAreaSet.AreaID equals AreaSet.AreaID
join ContactSet in Contacts on InvoiceSet.ContactID equals ContactSet.ContactID
join Contacts_ObjectsSet in Contacts_Objects on ContactSet.ContactID equals Contacts_ObjectsSet.ContactID
join CompanySet in Companies on Contacts_ObjectsSet.ObjectReferenceID equals CompanySet.CompanyID
join BookedAreasSet in BookedAreas on InvoiceSet.InvoiceID equals BookedAreasSet.InvoiceID
where Contacts_ObjectsSet.ObjectReference=="Company"
select new {InvoiceSet.InvoiceNumber,InvoiceSet.Amount,InvoiceSet.TotalDiscount,InvoiceSet.GST,
InvoiceSet.PaymentDate,InvoiceSet.ShoppingCentreID,BookedAreasSet.BookedAreaID,AreaSet.Name,Paid=(InvoiceSet.PaymentDate==null ? "UnPaid":"Paid"),
licensee=(CompanySet.CompanyName))
};
このクエリで次のようなものを選択したい:
DateRange=
(Min(BookedAreasSet.LeasedDate where BookedAreasSet.InvoiceID=InvoiceSet.InvoiceID)
+ "-" +
Max(BookedAreasSet.LeasedDate where BookedAreasSet.InvoiceID=InvoiceSet.InvoiceID)