Linq union all equivalent of sql code - sql

Question

I have the following queries:
var majorClients = maj in dbContext.MajorClients
where (maj.startdate > startDate)
where (maj.status == "Active")
Select new Client{EntityPK = maj.mjPrimaryKey,Name = maj.name, Type = "Maj"};
var minorClients = min in dbContext.MinorClients
where (min.startdate > startDate)
where (min.status == "Active" || min.status== "Inactive")
Select new Client{EntityPK = min.mnPrimaryKey,Name = min.name, Type = "Min"};
There are clients that could appear in both major and minor tables. I would like to return a list of all occurrences of clients in both tables, however if there are matching clients by name, then I would only want to return the matching record from the majorClients table.
I have written a sql query to return the results:
SELECT mjPrimaryKey AS EntityPK,name,'Maj' AS TYPE
FROM majorClients
WHERE status = 'Active' AND startDate > #startDate
UNION ALL
SELECT mnPrimaryKey,name,'Min' FROM minorClients
WHERE status IN ('Active','Inactive') AND startDate > #startDate
WHERE name NOT IN (SELECT name FROM majorClients WHERE status = 'Active' AND startDate > #startDate)
How would I represent this query in linq?

Answer 1

Try this linq. To exclude duplicates from minorClients, I've used Contains method. To union all objects - Union method:
var majorClients = from maj in dbContext.MajorClients
where maj.startdate > startDate
&& maj.status == "Active"
select new Client
{
EntityPK = maj.mjPrimaryKey,
Name = maj.name,
Type = "Maj"
};
var minorClients = from min in dbContext.MinorClients
where min.startdate > startDate
&& min.status == "Active" || min.status== "Inactive"
&& !(from maj in dbContext.MajorClients
where maj.startdate > startDate
&& maj.status == "Active"
select maj.name).Contains(min.Name)
select new Client
{
EntityPK = min.mnPrimaryKey,
Name = min.name,
Type = "Min"
};
var allClients = majorClients.Union(minorClients);