Anyone know how to perform a left join by more than one field?

I have several tables I'm working with. An example query is like this:

SELECT tbl1.Name, tbl1.Location, tbl1.Case,  tbl1.Class, tbl1.Type,
tbl3.Identity, tbl2.FileDate, tbl2.Status
FROM tbl2, tbl1 LEFT JOIN tbl3 ON tbl1.Case = tbl3.Case
WHERE tbl1.Case = tbl2.Case AND tbl1.Name LIKE '$Name%'

This returns everything I need, except that it also returns rows in tbl3
that I don't want (there can be multiple rows for the same Case). So I need
to limit by tbl1.Party = tbl3.Party as well.

If I add this to my where clause I defeat the purpose of the left join for
the null entries in table 3 and I don't know how to create two left join
statements for the same table. I know this is possible with many different
tables but found no info on two fields from the same two tables.

Any help would be appreciated.

Eric


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