Week08_day01 (Hive achieve WordCount count)

Hive achieve WordCount count

Before did not learn Hive, we learn to realize when MaprReduce WordCount count, it is necessary to write code for more than 80 java line, and now we learn the Hive, we only need one line Sql statement can be achieved.

Prepare data

 

 

 Create a table in the hive

 

 

 Using the import command to import the local data

 

 

 select check

 

 

 Each row of data is divided

　　　　select split(line,',') from wc;

 

 

 Rows into columns

　　　　select explode(split(line,',')) from wc; 

 

 

 The same group statistics

　　　　select w.word,count(*) from (select explode(split(line,',')) as word from wc) w group by w.word;