插入一些内容
INSERT INTO a(field1,field2) SELECT * FROM(SELECT f1,f2 FROM b JOIN c) AS tb;
修改时间格式 int -> date
SELECT DATE_ADD(FROM_UNIXTIME(0,'%Y-%m-%d %H:%i:%s'),interval EXTRACT(HOUR FROM TIMEDIFF(NOW() ,UTC_TIMESTAMP())) hour) from DUAL
2019-11-01
