Introduction to Hive Databases. Hive uses the statistics such as number of rows in tables or table partition to generate an optimal query plan. This chapter explains how to create a table and how to insert data into it. Hive owns the data for the internal tables. Internal table are like normal database table … Env: Hive metastore 0.13 on MySQL Root Cause: In Hive Metastore tables: "TBLS" stores the information of Hive tables. How to Find Tables that Contain a Specific Column in SQL Server Posted by AJ Welch While extremely powerful as a relational database, SQL Server can be somewhat daunting at times when it comes to looking up underlying information about the database system itself. The syntax and example are as follows: Syntax When using Hive, you access metadata about schemas and tables by executing statements written in HiveQL (Hive's version of SQL) such as SHOW TABLES.When using the HCatalog Connector, you can get metadata about the tables in the Hive database through several Vertica system 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. 1. Complete the following steps to see views that exist in a file system and tables that exist in Hive and HBase data sources: Find all the tables created by specific User In this Interview Question example, we are using the sys.column to get the column information, and sys.tables to get the database table names.-- Query to Find all Tables that Contain Column Name USE [SQL Tutorial] GO SELECT col.name AS [Column Name], tab.name AS [Table Name] FROM sys.columns col INNER JOIN sys.tables tab ON col.object_id = … The conventions of creating a table in HIVE is quite similar to creating a table using SQL. Hive Internal Table. Meta data tables in DBC database: Teradata meta data tables are stored in DBC database.The table level information present in the DBC.Tables and the column level information present in the DBC.Columns. When the user creates a table in Hive without specifying it as external, then by default, an internal table gets created in a specific location in HDFS. Hive supports both partitioned and unpartitioned external tables. Insert Command: The insert command is used to load the data Hive table. This case study describes creation of internal table, loading data in it, creating views, indexes and dropping table on weather data. The create external keyword is used to create a table and provides a location where the table will create, so that Hive does not use a default location for this table. You cannot create Hive or HBase tables in Drill. From Hive-0.14.0 release onwards Hive DATABASE is also called as SCHEMA. The following examples demonstrate the steps that you can follow when you want to issue the SHOW TABLES command on the file system, Hive, and HBase. There are 2 types of tables in Hive, Internal and External. In both cases, when a new table/partition is being added, the location is also specified for the new table/partition. Hive: Internal Tables. Create Table Statement. All the commands discussed below will do the same work for SCHEMA and DATABASE keywords in the syntax. So, Both SCHEMA and DATABASE are same in Hive. Viewing Hive Schema and Table Metadata. 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. Find all Tables with Specific Column Name. It is the default table in Hive. Examples. Similarly there are many useful meta data information stored in the DBC database. An EXTERNAL table points to any HDFS location for its storage, rather than default storage. "PARTITIONS" stores the information of Hive table partitions. In this post, we will check Apache Hive table statistics – Hive ANALYZE TABLE command and some examples. Other than optimizer, hive uses mentioned statistics in many other ways. Creating Internal Table. This article provides the SQL to list table or partition locations from Hive Metastore. Create Table is a statement used to create a table in Hive.

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