Question

I’m writing a linq-to-sql query that joins 4 tables. I have something like this:

var MyQuery = from a in MyDC.Table1
              from b in MyDC.Table2
              from c in MyDC.Table3
              from d in MyDC.Table4
              where .....

My question is about the where clause(s). I could write the where clause in one like this:

   where a.PropX == b.PropY && b.PropX == c.PropZ && ....

or multiple clauses like this:

   where a.PropX == b.PropY
   where b.PropX == c.PropZ
   ...

Is there going to be any difference in choosing one option or the other?

Thanks for your suggestions.

Answer 1

I would prefer neither of the above; instead I would follow the SQL syntax, which doesn’t hide the intent of the query as so:

var query  from a in MyDC.Table1 
           join b in MyDC.Table2 on a.Property1 equals b.Property2
           join c in MyDC.Table3 on b.Property1 equals c.Property5
           join d in MyDC.Table4 on c.Property2 equals d.Property1
select ...