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create table event_notifications (id int, event_data json, web_delivery int); insert into event_notifications values (1, null, 0), (2, '{}', 0), (3, '{"delivery_info": null}', 0), (4, '{"delivery_info": {}}', 0), (5, '{"delivery_info": {"email": {"delivered_at": "2024-05-16"}}}', 0), (6, '{"delivery_info": {"web": null}}', 0), (7, '{"delivery_info": {"web": {"delivered_at": "2024-05-16"}}}', 0); select * from event_notifications where json_contains(event_data, 'web', '$.delivery_info');

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