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任何人都可以幫助我嗎?我不能給下面的表達式轉換在SQL等效Lambda表達式,Lambda在SQL的from子句中加入「<>」的等效表達式
ON nextT.TaskID = a.NextTaskID AND a.TaskID <> nextT.TaskID
SQL轉換
SELECT a.*
FROM dbo.Action AS a INNER JOIN dbo.Task AS t
ON t .TaskID = a.TaskID
INNER JOIN dbo.Task AS nextT
ON nextT.TaskID = a.NextTaskID AND a.TaskID <> nextT.TaskID //This need to converted
我不完全試圖轉換表達式如下
等效Lambda表達式
var context = new DataClassesDataContext();
var data = (from a in context.Actions
join t in context.Tasks on a.TaskID equals t.TaskID
join nextT in context.Tasks
on
.......new {v1 = a.NextTaskID, v2 = a.TaskID} equals new {v1 = nextT.TaskID , v2 = nextT.TaskID}.....<---This is the problem.
select new vw_NextTask1
{
TaskID = a.TaskID,
Task = t.Title,
ActionID = a.ActionID,
Action = a.Title,
NextPhaseID = a.NextPhaseID,
NextTaskID = nextT.TaskID,
NextTask = nextT.Title,
Type = a.Type
}).ToList<vw_NextTask1>();
return data;
我們可以使用ON刪除所有檢查並在where子句中進行所有檢查。這兩種方式是否相同? – shomaail
Where子句和On子句之間存在差異b/w條件http://stackoverflow.com/questions/8311096/whats-the-difference-between-where-clause-and-on-clause-when-table-left -加入 – shomaail