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CREATE TABLE discount_codes(code INT, active VARCHAR2(4000) check (active is JSON) );
INSERT INTO discount_codes SELECT 1234,'{"active":"Y"}' FROM dual UNION ALL SELECT 2468,'{"active":"N"}' FROM dual UNION ALL SELECT 1359,'{"active":"Y"}' FROM dual
3 rows affected
SELECT d.code FROM discount_codes d CROSS JOIN JSON_TABLE(active, '$' COLUMNS ( active VARCHAR2(100) PATH '$.active' )) j WHERE j.active = 'Y'
CODE
1234
1359