how to convert sql union to linq

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Three useful Linq concepts operating on sets. Given set c and set e:

Concat gives you everything in c or e:

(From c In db.Customers Select c.Phone).Concat( _
             From c In db.Customers Select c.Fax).Concat( _
             From e In db.Employees Select e.HomePhone)

(From c In db.Customers _
            Select Name = c.CompanyName, Phone = c.Phone).Concat(From e In db.Employees _
            Select Name = e.FirstName & " " & e.LastName, Phone = e.HomePhone)

Union also gives you everything in c and e, but removes any duplicates:

(From c In db.Customers _
        Select c.Country).Union(From e In db.Employees _
        Select e.Country)

Except gives you everything in c that is not in e:

(From c In db.Customers _
             Select c.Country).Except(From e In db.Employees Select e.Country)

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