Mysql 按一列排序和分组
我想在子代中按日期时间字段订购此数据,电话号码按分组Mysql 按一列排序和分组,mysql,Mysql,我想在子代中按日期时间字段订购此数据,电话号码按分组 datetime |telephone|user | -------------------|---------|-------------------| 2019-11-15 20:41:43| 123|proident, sunt in | 2019-10-08 09:49:33| 456|a deserunt mollit | 2019-08-13 12:38:16
datetime |telephone|user |
-------------------|---------|-------------------|
2019-11-15 20:41:43| 123|proident, sunt in |
2019-10-08 09:49:33| 456|a deserunt mollit |
2019-08-13 12:38:16| 123334|d tempor incididun |
2019-07-24 21:44:15|123456789|sectetur adipisci |
2019-06-14 15:03:32|123456789|it, sed do eiusmod |
2019-05-20 07:09:01| 234234|aliqua. Ut enim |
2019-05-10 23:22:32| 90812345|Lorem ipsum dolor |
2019-03-25 17:27:37| 123334|fficia deserunt mo |
2019-02-25 22:32:19| 123| labore et dolore |
2019-02-18 16:01:05|123456789|lit, sed do eiusmo |
我已经试过了,但还不够
SELECT * FROM(select * from test order by test.`datetime` desc LIMIT
18446744073709551615) as sub;
例如,我想让电话123在第一个位置重复两次,其日期时间字段按子代顺序排列
datetime |telephone|user |
-------------------|---------|-------------------|
2019-11-15 20:41:43| 123|proident, sunt in |
2019-02-25 22:32:19| 123| labore et dolore |
2019-10-08 09:49:33| 456|a deserunt mollit |
2019-08-13 12:38:16| 123334|d tempor incididun |
2019-07-24 21:44:15|123456789|sectetur adipisci |
2019-06-14 15:03:32|123456789|it, sed do eiusmod |
2019-02-18 16:01:05|123456789|lit, sed do eiusmo |
2019-05-20 07:09:01| 234234|aliqua. Ut enim |
2019-05-10 23:22:32| 90812345|Lorem ipsum dolor |
2019-03-25 17:27:37| 123334|fficia deserunt mo |
您可以通过将表自连接到包含每个电话值的datetime最大值的表,然后根据这些最大值进行排序,然后是该行的实际datetime值来实现此结果:
SELECT t1.*
FROM test t1
JOIN (SELECT telephone, MAX(datetime) AS datetime
FROM test
GROUP BY telephone) t2 ON t2.telephone = t1.telephone
ORDER BY t2.datetime DESC, t1.datetime DESC
输出:
datetime telephone user
2019-11-15 20:41:43 123 proident, sunt in
2019-02-25 22:32:19 123 labore et dolore
2019-10-08 09:49:33 456 a deserunt mollit
2019-08-13 12:38:16 123334 d tempor incididun
2019-03-25 17:27:37 123334 fficia deserunt mo
2019-07-24 21:44:15 123456789 sectetur adipisci
2019-06-14 15:03:32 123456789 it, sed do eiusmod
2019-02-18 16:01:05 123456789 lit, sed do eiusmo
2019-05-20 07:09:01 234234 aliqua. Ut enim
2019-05-10 23:22:32 90812345 Lorem ipsum dolor
限制18446744073709551615在这一点上,我想你可以删除LIMIT@kamboj别担心。我很高兴能帮上忙。