hive 日常技巧

建表

 

hadoop fs -put data.txt hdfs_path
 
drop table tablename;
CREATE TABLE tablename
(
column1 string,
column2 string
)
partitioned by (column2 string,columns4 string)
row format delimited
fields terminated by ','
stored as textfile
;
 
load data inpath 'hdfs_path/data.txt' into table tablename;

 

添加表字段

use 库名;
alter table table_name add columns(column1 int, column2 int);  

 

显示列名：Set hive.cli.print.header = true;

 

返回星期几（0～6）：pmod(datediff(date, '1920-01-01') - 3, 7