SELECT true AS "Go to gym?"
FROM DUAL
WHERE
(SELECT WAIST_SIZE_INCHES FROM ME.BODY) > 32
AND
EXISTS
(SELECT 1 FROM ME.DESIRE UNION ALL
SELECT 1 FROM ME.TRANSPORTATION UNION ALL
)
AND NOT EXISTS
(SELECT 1 FROM ME.SCHEDULING_CONFLICTS UNION ALL
SELECT 1 FROM ME.SICK UNION ALL
SELECT 1 FROM WORK.PRODUCTION_OUTAGE UNION ALL
SELECT 1 FROM WIFE.DATE_NIGHT
);