摘要：参考资料：https://www.cnblogs.com/ruizhang3/p/6539730.html http://www.jb51.net/article/113432.htm :insert Raw data {u'h': 0L, u'ts': Timestamp(1519780847, 阅读全文

摘要：select top distinct column_name from tbl where id>0 group by name having count(*)>10 order by dtime desc age asc limit 1 60、NULL是没有值，空串是一个有效值61、主键只能使用 阅读全文