1.查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断select * from peoplewhere peopleId in (select peopleId from people group by peopleId having count(peopleId) > 1) 2.删除表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断,只留有rowid最小的记录delete from people where peopleId i
l = [1,2,3,2,1] # l = ['你','我','他','她','你'] for i in l: print("the %s has found %s" % (i, l.count(i))) #find duplicate number # print("the %s has found %s" % (i, l.count(i))) #find duplicate string#the method above would repeat count d
当我们做工程包迁移时,经过会遗漏部分更改过的定义.我们可以用下面的SQL来查找变更项 变量 &OPRID =代码变更者 变量 &PROJECT 项目工程名 SELECT * FROM PSPCMPROG A WHERE LASTUPDOPRID = '&OPRID' )--一个月内,可自定义周期 AND NOT EXISTS (SELECT 'X' FROM PSPROJECTITEM X WHERE X.PROJECTNAME = '&PROJECT' AND X.OBJ
机器学习实战(Machine Learning in Action)学习笔记————08.使用FPgrowth算法来高效发现频繁项集 关键字:FPgrowth.频繁项集.条件FP树.非监督学习作者:米仓山下时间:2018-11-3机器学习实战(Machine Learning in Action,@author: Peter Harrington)源码下载地址:https://www.manning.com/books/machine-learning-in-actiongit@github.c