--function to get random number============================================================= -- DROP FUNCTION IF EXISTS get_random_number(integer, integer); CREATE OR REPLACE FUNCTION get_random_number(integer, integer) RETURNS integer AS $BODY$ DECLARE start_int ALIAS FOR $1; end_int ALIAS FOR $2; BEGIN RETURN trunc(random() * (end_int-start_int + 1) + start_int); END; $BODY$ LANGUAGE plpgsql; --产生1-10之间的随机数(包括边缘) --SELECT get_random_number(1, 10); --function for get random date between start_date and end_date -- DROP FUNCTION IF EXISTS get_random_date(date, date); CREATE OR REPLACE FUNCTION get_random_date(start_date date, end_date date) RETURNS integer AS $BODY$ DECLARE interval_days integer; random_days integer; random_date date; BEGIN interval_days := end_date - start_date; random_days := get_random_number(0, interval_days); random_date := start_date + random_days; RETURN date_part('year', random_date) * 10000 + date_part('month', random_date) * 100 + date_part('day', random_date); END; $BODY$ LANGUAGE plpgsql; -- SELECT get_random_date('2000-01-01', '2013-12-31');--result:20100902
postgresql产生随机数和随机日期的存储过程
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转载自lovelease.iteye.com/blog/2026186
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