If we run create table command and that table is already present then Hive will throw an error. CREATE DATABASE was added in Hive 0.6 ().. Hive is designed to support a relatively low rate of transactions, as opposed to serving as an online analytical processing (OLAP) system. "is regarded as a Hive system property. In this blog, we will discuss many of these options and different operations that we can perform on Hive tables. This command shows meta data about the hive table which includes list of columns,data types and location of the table.There are three ways to describe a table in Hive. Database,Table: SHOW: Databases,Tables,Table Properties,Partitions,Functions,Index: DESCRIBE: Database, Table ,View: Let’s look at the usage of the top hive commands in HQL on both databases and tables – ... Show Table Command in Hive. In the next chapters, we will learn more about table properties. SHOW PARTITIONS table_name; Show Table Properties (Version: Hive 0.10.0): SHOW TABLE PROPERTIES lists all of the table properties for the table. For more information about these properties, see your Hive documentation. It is used with databases, tables, table properties, functions and index as well. To handle this gracefully we can add IF NOT EXISTS clause as we did in the creation of databases. Right-click a table index in the Model Explorer and click Properties. ( Log Out /  All other properties defined with OPTIONS will be regarded as Hive serde properties.. Interacting with Different Versions of Hive Metastore. You’ll see if the transactional property set to true or false. I have started blogging about my experience while learning these exciting technologies. Apache Hive is a data warehousing tool used to perform queries and analyze structured data in Apache Hadoop. To view the properties of a table use the below command in hive prompt. Note that using the database name and like/rlike statement (query 2 and query3) do not work together. You can set these configuration properties either in the hive-site.xml file or in the start of the session before any query runs. Go to Hive shell by giving the command sudo hive and enter the command ‘create database’ to create the new database in the Hive.. To list out the databases in Hive warehouse, enter the command ‘show databases’. We will learn how to get distinct values as well as count of distinct values. USE Hive supports the concept of a database as a logical collection of objects stored in separate catalogs or namespaces. For using a table in ACID writes ( such as insert, update, delete) then we have to set the table property “transactional=true”. Table Properties. Describe table_name: If you want to see the primary information of the Hive table such as only the list of columns and its data types,the describe command will help you on this. We can use similar query to change column data type. Change ), You are commenting using your Google account. Change ), You are commenting using your Twitter account. https://subscription.packtpub.com/.../4/ch04lvl1sec56/show-the-table-properties Delta File Compaction¶. Adds custom or predefined metadata properties to a table and sets their assigned values. Comment document.getElementById("comment").setAttribute( "id", "a10bec5d9c309006dc79b1f35fc5e2ef" );document.getElementById("j227d9a234").setAttribute( "id", "comment" ); Save my name, email, and website in this browser for the next time I comment. Creating views. When it comes to the table, Alter Table is a versatile command which we can use to do multiple useful things like changing table name, changing column data type, etc. When creating a table with HiveCatalog, it’s by default considered generic. You can use either of one in a single query. We can also add IF EXISTS clause to make sure we do not get an error if the table is not present in Hive. Below is simple example. 6. Dropping views. Getting distinct values from columns or rows is one of most used operations. This is the first form in the syntax. Lets check it with an example. In this chapter, we have learned basic commands for managing tables in the hive. I am passionate about Cloud, Data Analytics, Machine Learning, and Artificial Intelligence. But there is a catch when using IF NOT EXISTS with a hive table. To see the properties in a table, use the SHOW TBLPROPERTIES command.. Apache Hive Managed tables are not supported, so setting 'EXTERNAL'='FALSE' has no effect.. Synopsis We discussed many of these options in Text File Encoding of Data Values and we’ll return to more advanced options later in Chapter 15. Shows information for all tables matching the given regular expression. We can use Alter table command to rename table. There might be some cases where you want to replace all column names and their data types with new columns. ( Log Out /  Show the table properties. The Table creation in Hive is similar to SQL but with many additional features. Property value returned by this statement excludes some properties that are internal to spark and hive. To define Hive table index properties. # col_name              data_type               comment. HIVE Internal Table. The TBLPROPERTIES clause enables you to use your own metadata key/value pairs to tag the table definition. [('property_name')] If included, only the value of the property named property_name is listed. Check it below query example. Your email address will not be published. SHOW TABLE EXTENDED. Note. The uses of SCHEMA and DATABASE are interchangeable – they mean the same thing. Table properties can be used to tell hive details about underlying data and can also be used to integrate hive with other databases like HBase or DyanmoDB. Select the table from the Table drop-down that contains the index that you want to define. You can use the SHOW TRANSACTIONS command to list open and aborted transactions. Run query silent mode hive ‐S ‐e 'select a.col from tab1 a' Set hive config variables hive ‐e 'select a.col from tab1 a' ‐hiveconf hive.root.logger=DEBUG,console Use initialization script hive ‐i initialize.sql Run non-interactive script hive ‐f script.sql Hive Shell Function Hive

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