Could you describe your intent in more detail?
SELECT * FROM ... GROUP BY is unstable at best, so I cannot really grasp
your intention. Which lookup record's
If I guess right, you might want something in the lines of:
SELECT
w.post_processing_info,
l.is_json
FROM
webpage_contents w
JOIN
(SELECT DISTINCT is_json from lookup_tables.lookups) l
USING (content_hash)
WHERE
content_hash = 'abc'
(this might return 0-3 rows if lookup_tables contains 3 values (0,1,and
NULL) for is_json)
which in turn I think would optimize best if written as:
SELECT DISTINCT
w.content_hash,
w.post_processing_info,
l.is_json
FROM
webpage_contents w
JOIN
lookup_tables.lookups l
USING (content_hash)
WHERE
content_hash = 'abc'
--
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