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CREATE TABLE Test ( id int, birthday date, hired_at date ); INSERT INTO Test Values (1, NULL), (2, NULL), (3, NULL); UPDATE Test SET birthday = ( '1960-01-01'::date + round(random()*(now()::date - '1960-01-01'::date))::int ); UPDATE Test SET hired_at = ( birthday + (18 * 365) + round(random()*(now()::date - birthday - (18 * 365)))::int ); SELECT * FROM Test
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