[IF NOT EXISTS] is used to notify the user if the new database is already existed in the system. The theme for structured data analysis is to store the data in a tabular manner, and pass queries to analyze it. Hive - Create Database.
Since in HDFS everything is FILE so HIVE stores all the information in FILEs only. I am trying to create a schema under a DB sam_db in hive. The conventions of creating a table in HIVE is quite similar to creating a table using SQL. Create your first Table in HIVE and load data into it.
Hive is a database technology that can define databases and tables to analyze structured data. Before we start with the SQL commands, it is good to know how HIVE stores the data. Tables in that database will be stored in sub directories of the database directory.
CREATE DATABASE is the same as create database. The CREATE DATABASE command creates the database under HDFS at the default location: /user/hive/warehouse. Create Table is a statement used to create a table in Hive. We need to establish the connection between the hive client and the hive server.
You can always use CREATE TABLE
Initially, we check the default database provided by Hive. Hive creates a directory for each database. If the specified path does not already exist in the underlying file system, this command tries to create a directory with the path. CREATE DATABASE in Hive. Create a database. Hive deals with two types of table structures like Internal and External tables depending on the loading and design of schema in Hive. alter table old_database.table_a rename to new_database.table_a; The above statements will also move the table data on hdfs if table_a is a managed table. CREATE DATABASE was added in Hive 0.6. Create Hive database and tables The Hive queries are shared in the GitHub repository and can be downloaded from there. DDL Commands On Databases in Hive 1. I am using the folowing code. WITH DBPROPERTIES So now, let us go through each of the commands deeply. In Hive, the database is considered as a catalog or namespace of tables. The CREATE DATABASE statement is used to create a database in the Hive. The syntax and example are as follows: Syntax
Internal tables Internal Table is tightly coupled in nature.In this type of table, first we have to create table and load the data. HIVE Query Language (HQL) – HIVE Create Database, Create Table Team RCV Academy In this section, we will discuss data definition language parts of HIVE Query Language(HQL), which are used for creating, altering and dropping databases, tables, views, functions, and indexes. Hive Query to Create Database.