[英]C# LINQ Query with group by, having and where clause invalid
我有以下Linq查詢,正在以下錯誤中。 我的問題是如何在where子句中使用T_EquipmentCompetency.Competency,但在group by或select列表中沒有它。 我對LINQ查詢還很陌生。 我在這里缺少什么嗎?
using (EntitiesModel dbContext = new EntitiesModel())
{
var competencyForMachine = (from eq in dbContext.T_Equipmentcompetencies
where eq.MachineId == machineId
select eq.CompetencyId);
var competencyForEmployees = (from sm in dbContext.T_OHS_Skillsmatrices
join em in dbContext.T_Employees on sm.EmployeeID equals em.EmployeeID
where competencyForMachine.Contains(sm.CompentencyID)
group sm by new {sm.EmployeeID,em.FirstNameSTR,em.LastNameSTR} into g
where g.Count() == competencyForMachine.Count()
select new {g.Key.EmployeeID, g.Key.FirstNameSTR,g.Key.LastNameSTR});
foreach(var employee in competencyForEmployees)
{
RadMenuItem employeeItem = new RadMenuItem { Text= employee.FirstNameSTR + " " + employee.LastNameSTR, Value = employee.EmployeeID.ToString()};
Item.Items.Add(employeeItem);
}
}
這是我得到的錯誤
Telerik.OpenAccess.RT.sql.SQLException: Column
'dbo.T_EquipmentCompetency.CompetencyId' is invalid in the select list
because it is not contained in either an aggregate function or the GROUP BY clause.
我嘗試模擬的SQL在SQL Server中工作
declare @MachineId int = 1
select sm.EmployeeID,em.FirstNameSTR,em.LastNameSTR
from T_OHS_SkillsMatrix sm
inner join T_Employees em on sm.EmployeeID = em.employeeId
where sm.CompentencyID in ( select CompetencyID
from T_EquipmentCompetency
where MachineId = @machineId
)
group by sm.EmployeeID,em.FirstNameSTR,em.LastNameSTR
having count(*) = (select count(*) from T_EquipmentCompetency where MachineId = @MachineId)
你弄錯了
select eq.CompetencyId --- different spelling
sm.CompentencyID
而在sql sql server中
where sm.CompentencyID in ( select CompentencyID
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