摘要:
https://www.cnblogs.com/bugDiDiDi/p/16591670.html List userList_new = Lists.newArrayList(); list.stream().forEach( s -> { if (!userList_new.contains(s 阅读全文
摘要:
sql拿两天之内的时间 SELECT * FROM room_message WHERE send_date BETWEEN UNIX_TIMESTAMP( now())-172800 AND now() ;(172800是从1970-01-01 08:00:00到时间的相隔的秒数) select 阅读全文
摘要:
select GROUP_CONCAT(id) from a where age > 20; 把几条只有一个不同的字段记录合成一条 https://blog.csdn.net/John_D_B_Lee/article/details/120977113 select @@GLOBAL.sql_mod 阅读全文