Beginner Join question

Been out of DB programming for a while, and am trying to get back in
with postgres under Linux.

Anyway, my question (should be fairly simple, but the manuals
arn't quite clear) is as follows:

TABLE A ( TABLE B(
record_id record_id
field1 field3
field2) field4)

record_id in both tables are the same.
The record definitely exists in TABLE A, but not
necessarily in TABLE B.

I need to get the following:

record_id | A.field1 | A.field2 | B.field3
-------------------------------------------------------------------
rec1 | xxxx | xxxxxx | Field displayed if there is
| | | a record in B, such that A.record_id
| | | is equal to B.record.id, otherwise
| | | leave it blank.
-------------------------------------------------------------------

I'm going to have about a million records in each table, so
efficiency of the join is a priority. Disk space is not.

Thanks in advance.

--Calvin

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