I have a query like:
var result = from u in this.DataContext.Users
join l in DataContext.Locations on u.Id equals l.userId
where u.active == 1
select u;
return result ;
I want to add a subquery WHERE IN clause like:
WHERE u.Id IN (SELECT userId FROM approved_users)
Is this possible?
I am not sure why you want it in a sub query, it seems simpler to just join the Approved Users table, but I do not know the requirement so I have presented two options. One option that has a sub query and one option with the additional join. I am also making an assumption that you don't have any navigation properties.
Option 1 - Subquery:
var subQuery =
from u in context.Users.Where(x => context.ApprovedUsers.Select(y => y.ApprovedUserId).Contains(x.UserId))
join l in context.Locations on u.UserId equals l.UserId
where u.IsActive == true
select u;
which generates something like this
SELECT
[Extent1].[UserId] AS [UserId],
[Extent1].[Name] AS [Name],
[Extent1].[IsActive] AS [IsActive]
FROM [dbo].[User] AS [Extent1]
INNER JOIN [dbo].[Location] AS [Extent2] ON [Extent1].[UserId] = [Extent2].[UserId]
WHERE ( EXISTS (SELECT
1 AS [C1]
FROM [dbo].[ApprovedUser] AS [Extent3]
WHERE [Extent3].[ApprovedUserId] = [Extent1].[UserId]
)) AND (1 = [Extent1].[IsActive])
Option 2 - Additional Join:
var query =
from u in context.Users
join l in context.Locations on u.UserId equals l.UserId
join au in context.ApprovedUsers on u.UserId equals au.ApprovedUserId
where u.IsActive == true
select u;
which generates:
SELECT
[Extent1].[UserId] AS [UserId],
[Extent1].[Name] AS [Name],
[Extent1].[IsActive] AS [IsActive]
FROM [dbo].[User] AS [Extent1]
INNER JOIN [dbo].[Location] AS [Extent2] ON [Extent1].[UserId] = [Extent2].[UserId]
INNER JOIN [dbo].[ApprovedUser] AS [Extent3] ON [Extent1].[UserId] = [Extent3].[ApprovedUserId]
WHERE 1 = [Extent1].[IsActive]
