pig是处理流 的工具,所以数据集是流对象,处理步骤也是一样的. Pig中存在按条件处理流对象的方式有 1)filter X= FILTER A BY (f1 == 8); 2)CASE WHEN THEN ELSE END CASE expression [ WHEN value THEN value ]+ [ELSE value ]? END 3)Bincond[?:] condition? value_if_true : value_if_false 4)SPLITaliasINTO al
[抄题]: You are given a string representing an attendance record for a student. The record only contains the following three characters: 'A' : Absent. 'L' : Late. 'P' : Present. A student could be rewarded if his attendance record doesn't contain more
折腾了半天终于把这个给折腾顺了,但是后来发现用不了竟然...悲剧啊,但是还是要记录下加深记忆 insert into table1 (field1, field2,field3) select ?field1,?field2,?field3 from temp where not exists (select field1,field2,field3 from table1 where field1=?field1 and field2=?field2 and field3=?field3);
周五更新很累... 坚持,年薪20万又进了一步~~ python中的条件语句以[ if ]开头,条件语句成立时,运行该代码块,如果条件不成立,则跳过该代码块,执行后面的代码块. 简单的小示例: 输入性别,进行简单的判断,用if语句实现代码. sex = '男生' if sex == '男生': #新手盆友一定注意1.要用==两个等于号才是等于的意思:2.结尾记得加冒号. print('小刚是:'+sex) print('条件成立为True,所以输出if语句,下面的print语句块') sex_2