That's pretty cool, I didn't know that one. But I still want to return the
result from table1 when there is null category.
This returns 4 correct results but needs to return the two product_code 3s
with null category:
SELECT table1.product_code, table1.date_signed, table1.description,
COALESCE (( SELECT table3.category FROM table3 WHERE table3.psc_code = table1.product_code AND
lower(table1.description)LIKE ('%' || lower(table3.lookup_value) ||
'%') ), table2.category)
FROM table1 JOIN table2 ON table2.psc_code = table1.product_code
WHERE date_signed = '2017-02-01';
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