JOIN, GROUP BY 및 SUM이있는 SQL과 Entity Framework 쿼리를 매핑하십시오.

Question

다음 SQL을 EF 쿼리에 매핑하고 싶습니다. 비슷한 주제를 찾았지만 여전히 매핑을 수행하지 못했습니다. {0} ... {2}은 (는) SQL 매개 변수입니다.

SELECT TaskGroup.Project AS Project 
SUM(Datediff(minute, WorkLog.StartTime, WorkLog.EndTime))/60 AS Hours 
FROM WorkLog INNER JOIN TaskDefinition ON WorkLog.TaskDefinitionID = TaskDefinition.ID 
INNER JOIN TaskGroup ON TaskDefinition.TaskGroupID = TaskGroup.ID 
WHERE WorkLog.EmployeeID = {0} AND WorkLog.Status = 5 AND 
    WorkLog.StartTime >= {1} AND WorkLog.EndTime < {2} 
GROUP BY TaskGroup.Project 

Answer 1

var query = (from wl in WorkLog 
      join td in TaskDefinition on wl.TaskDefinitionID equals td.ID 
      join tg in TaskGroup on td.TaskGroupID equals tg.ID 
      where wl.EmployeeID == { 0} && wl.Status == 5 
       && wl.StartTime >= { 1} && wl.EndTime < { 2} 
      select new 
      { 
       Project = tg.Project, 
       StartTime = wl.StartTime, 
       EndTime = wl.EndTime 
      }) 
      .GroupBy(o => o.Project) 
      .Select(g => new 
      { 
       Project = g.Key, 
       Hours = g.Sum(o => (o.EndTime - o.StartTime).Minutes)/60 
      });