https://www.youtube.com/watch?v=FG1rpwnVR6U Step 1 : Login to hive using below command: hive Step 2 : Suppose you want to create a schema named as mydb1 , use below command create schema mydb1; Step 3 : To use this schema ,use below command : use mydb1; Step 4 : To see allRead More →
Requirement You have comma separated file and you want to create an external table in the hive on top of it (need to load CSV file in hive), then follow the below steps. Solution Step 1: Sample CSV File Create a sample CSV file named as sample_1.csv. You can downloadRead More →
Requirement You have one hive table named as infostore which is present in bdp schema. It is needed to get the data into Excel file. Solution. Let’s say the location where output file should present is /root/local_bdp/posts/export-hive-data-into-file Step 1: Create Output directory mkdir /root/local_bdp/posts/export-hive-data-into-file/output Step 2: Go to hive CLIRead More →
Requirement You have comma separated(CSV) file and you want to create Avro table in hive on top of it, then follow below mentioned steps. Solution Step 1: Sample CSV File Create a sample CSV file named as sample_1.csv file. download from here (You can skip this step if you alreadyRead More →
Requirement You have comma separated(CSV) file and you want to create Parquet table in hive on top of it, then follow below mentioned steps. Solution Step 1: Sample CSV File Create a sample CSV file named as sample_1.csv file. download from here (You can skip this step if you alreadyRead More →
Requirement You have two table named as A and B. and you want to perform all types of join in hive . It will help you to understand, how join works in hive. Solution Step 1: Input Files Download file and from here. And place them into a local directory. FileRead More →
#execute a query in Silent(S)Mode hive -S -e “your hive query” #execute a query hive -e “your hive query” #show current database hive>set hive.cli.print.current.db=true; #show all column names for a table hive>set hive.cli.print.header=true; #to run all pre required commands in one go 1.create .hiverc fileRead More →
Requirement In this post, we are going to explore windowing functions in Hive. These are the windowing functions: LEAD LAD FIRST_VALUE LAST_VALUE MIN/MAX/COUNT/AVG OVER Clause Component Involved Hive Sample Data ID FIRST_NAME LAST_NAME DESIGNATION DEPARTMENT SALARY 1001 Jervis Roll Director of Sales Sales 30000 1002 Gordon Mattster Marketing Manager SalesRead More →
Requirement In this post, we are going to explore analytics functions in Hive. These are the following analytics function available in the hive: ROW_NUMBER RANK DENSE_RANK CUME_DIST PERCENT_RANK NTILE Component Involved Hive Sample Data ID FIRST_NAME LAST_NAME DESIGNATION DEPARTMENT SALARY 1001 Jervis Roll Director of Sales Sales 30000 1002 GordonRead More →
Requirement In this post, we will go through the concept of Bucketing in Hive. This post will cover the below-following points about Bucketing: What is Bucketing in Hive? How to load data into a Bucketed table? What is its importance? Components Involved HIVE HDFS Sample Data We will use theRead More →
Requirement There is an uncertain number of columns present in the hive table. Sometimes a table can have many numbers of columns and sometimes it can have few numbers of columns. If we want the value of all the columns from the table, then there is no any challenge asRead More →
Requirement In this post, we are going to understand what is hive_default_partition in hive and why it gets created. Components Involved HDFS HIVE Sample Data We will use below sample data for the task. This is the sample data of employee details. Some employees are the member of company’s sportsRead More →
Requirement Suppose we are having a hive partition table. This table is partitioned by the year of joining. Our requirement is to drop multiple partitions in hive. Components Involved Hive HDFS Sample Data Let’s say we are having given sample data: Here, 1 record belongs to 1 partition as weRead More →
Requirement There are two files which contain employee’s basic information. One file store employee’s details who have joined in the year of 2012 and another is for the employees who have joined in the year of 2013. Now, we want to load files into hive partitioned table which is partitionedRead More →
Requirement Suppose we are having some data in a hive table. The table contains information about company’s quarterly wise profit. Now, the requirement is to find max profit of each company from all quarters. Sample Data The record having 5 columns – company name, quarter 1 as Q1, quarter 2Read More →
