> Has anybody done this? If so, can you send me a sample?
CREATE TEMPORARY TABLE fruits (id SERIAL, name TEXT);
INSERT INTO fruits VALUES (DEFAULT, 'banana');
INSERT INTO fruits VALUES (DEFAULT, 'apple');
CREATE TEMPORARY TABLE food (id SERIAL, name TEXT);
INSERT INTO food VALUES (DEFAULT, 'apple');
INSERT INTO food VALUES (DEFAULT, 'spinach');
SELECT name, CASE WHEN name = ANY (SELECT name FROM fruits) THEN 'yes' ELSE 'no'
END AS fruit
FROM food;
name | fruit
---------+-------apple | yesspinach | no
(2 lines)
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