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SQL select - field value may be null

Last Modified: 2012-05-12
I wrote a code to select 2 values from 3 tables, but have a problem since one of field value may be null. Please help!

The code is here:
select tbl1.name, tbl2.name from tbl1, tbl2, tbl3 where tbl1.ctid = tbl2.ctid and tbl1.iid = tbl3.iid and tbl3.oid = 5;

need to add to this code that tbl2.cid may be null?
Could you help me to do that? Thanks.
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