mysql获取时间整点
1.获取当天整点时间
SELECT * FROM ( SELECT DATE_FORMAT(CURDATE(),'%Y-%m-%d %H') AS hh UNION SELECT DATE_FORMAT(DATE_ADD(CURDATE(),INTERVAL 2 HOUR),'%Y-%m-%d %H') AS hh UNION SELECT DATE_FORMAT(DATE_ADD(CURDATE(),INTERVAL 4 HOUR),'%Y-%m-%d %H') AS hh UNION SELECT DATE_FORMAT(DATE_ADD(CURDATE(),INTERVAL 6 HOUR),'%Y-%m-%d %H') AS hh UNION SELECT DATE_FORMAT(DATE_ADD(CURDATE(),INTERVAL 8 HOUR),'%Y-%m-%d %H') AS hh UNION SELECT DATE_FORMAT(DATE_ADD(CURDATE(),INTERVAL 10 HOUR),'%Y-%m-%d %H') AS hh UNION SELECT DATE_FORMAT(DATE_ADD(CURDATE(),INTERVAL 12 HOUR),'%Y-%m-%d %H') AS hh UNION SELECT DATE_FORMAT(DATE_ADD(CURDATE(),INTERVAL 14 HOUR),'%Y-%m-%d %H') AS hh UNION SELECT DATE_FORMAT(DATE_ADD(CURDATE(),INTERVAL 16 HOUR),'%Y-%m-%d %H') AS hh UNION SELECT DATE_FORMAT(DATE_ADD(CURDATE(),INTERVAL 18 HOUR),'%Y-%m-%d %H') AS hh UNION SELECT DATE_FORMAT(DATE_ADD(CURDATE(),INTERVAL 20 HOUR),'%Y-%m-%d %H') AS hh UNION SELECT DATE_FORMAT(DATE_ADD(CURDATE(),INTERVAL 22 HOUR),'%Y-%m-%d %H') AS hh ) hourtable
结果：
2.当前时间往前推的时间点
SELECT * FROM ( SELECT DATE_FORMAT((NOW() - INTERVAL 0 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 2 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 4 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 6 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 8 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 10 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 12 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 14 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 16 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 18 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 20 HOUR),'%Y-%m-%d-%H') AS hh) hourtable
结果：
示例：
SELECT SUBSTRING(hourtable.hh,12)AS TIME, COALESCE(manytable.ss,0) ss, COALESCE(manytable.ys,0) ys,COALESCE(manytable.ddbs,0) ddbs FROM ( SELECT DATE_FORMAT((NOW() - INTERVAL 0 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 2 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 4 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 6 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 8 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 10 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 12 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 14 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 16 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 18 HOUR),'%Y-%m-%d-%H') AS hh UNION SELECT DATE_FORMAT((NOW() - INTERVAL 20 HOUR),'%Y-%m-%d-%H') AS hh) hourtable LEFT JOIN ( SELECT DATE_FORMAT(o.updated_at, '%Y-%m-%d-%H') xh, COALESCE(SUM( o.amount_paid ) ,0) ss, COALESCE(SUM( o.amount_payable ),0) ys, COALESCE(COUNT( o.record_key ),0) ddbs, park_key as pid FROM p_park_record o WHERE DATE_FORMAT( o.updated_at, '%Y-%m-%d-%H' ) > DATE_FORMAT( ( NOW( ) - INTERVAL 20 HOUR ), '%Y-%m-%d-%H' ) GROUP BY DATE_FORMAT(o.updated_at, '%Y-%m-%d-%H'),pid ) manytable ON hourtable.hh = manytable.xh <if test="parkId != null and parkId != ''"> AND manytable.pid = #{parkId} </if> ORDER BY hourtable.hh
效果：
总结
以上为个人经验，希望能给大家一个参考，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/weixin_43357106/article/details/117788130
