Asking for help, clarification, or responding to other answers. Which languages have different words for "maternal uncle" and "paternal uncle"? Before becoming an open source project of Apache Hadoop, Hive was originated in Facebook. Use where clause to fetch specific partition information from the Hive table. SHOW PARTITIONS table_name; Lets create a customer table with 2 partition columns ‘country’ and ‘state’ and add few partitions to it. Syntax SHOW TABLES [ { FROM | IN } database_name ] [ LIKE regex_pattern ] Parameters { FROM | IN } database_name SHOW CREATE TABLE ; 3. Thanks for contributing an answer to Stack Overflow! XML Word Printable JSON. The original point stands, I think: show tables like 'abc' works, but show tables not like 'abc' does not. So, Both SCHEMA and DATABASE are same in Hive. EXTERNAL and LOCATION clause also works for views. How to get the sizes of the tables of a MySQL database? yes, if you’re on 5.0+ you can query the “tables” table with a WHERE clause. It provides a mechanism to project structure onto the data in Hadoop and to query that data using a SQL-like language called HiveQL (HQL). When creating an external table in Hive, you need to provide the following information: Name of the table – The create external table command creates the table. I cannot understand why I get a nasty syntax error - it works when I have just LIKE rather than NOT LIKE but I want all the tables that are NOT like it. The syntax of show partition is pretty straight forward and it works on both internal or external Hive Tables. I am able to use the statement like below to find tables like in hive. 3. First issue the USE command to identify the schema for which you want to viewtables or views. For example, Hive table column value may contain a string that has embedded percentage (%) sign, in that case escape character functionality will allow you to ignore those during string matching. Returns all the tables for an optionally specified database. If no database is specified then the tables are returned from the current database. Where do you think the information displayed by, The original question seems to be about using, State of the Stack: a new quarterly update on community and product, Podcast 320: Covid vaccine websites are frustrating. Also, for external tables, data is not deleted on dropping the table. 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.. We will also look into SHOW and DESCRIBE commands for listing and describing databases and tables stored in HDFS file system. Convex lattice polygons with equal area and perimeter. Hive is used because the tables in Hive are similar to tables in a relational database. Hive is getting immense popularity because tables in Hive are similar to relational databases. Apache Hive is a data warehousing tool used to perform queries and analyze structured data in Apache Hadoop. Hive Show - Learn Hive in simple and easy steps from basic to advanced concepts with clear examples including Introduction, Architecture, Installation, Data Types, Create Database, Use Database, Alter Database, Drop Database, Tables, Create Table, Alter Table, Load Data to Table, Insert Table, Drop Table, Views, Indexes, Partitioning, Show, Describe, Built-In Operators, Built-In Functions What's the map on Sheldon & Leonard's refrigerator of? CREATE DATABASE was added in Hive 0.6 ().. Is a comment aligned with the element being commented a good practice? Solved: Hello Everyone! If a table of the same name already exists in the system, this will cause an error. There are many DDL commands. Dec 18, 2020 To avoid this, add if not exists to the statement. Hive LIKE statement Escape Characters. If a managed table or partition is dropped, the data and metadata associated with that table or partition are deleted. Tables can also be given an alias, this is particularly common in join queries involving multiple tables where there is a need to distinguish between columns with the same name in different tables. The output is order alphabetically by default. For example, if its a mysql DB, you can connect to the Hive … CREATE TABLE IF NOT EXISTS employee ( id INT COMMENT 'employee ID', name STRING COMMENT 'employee name' ) ; 1. In this article, we are going to learn Hive DDL commands. Retrieving the last record in each group - MySQL, Host 'xxx.xx.xxx.xxx' is not allowed to connect to this MySQL server, Insert into a MySQL table or update if exists, Create a temporary table in a SELECT statement without a separate CREATE TABLE, Get table names using SELECT statement in MySQL. Hive deals with two types of table structures like Internal and External tables depending on the loading and design of schema in Hive. do the same thing as what you wanted to do? Connect and share knowledge within a single location that is structured and easy to search. A plenty of users are simultaneously querying data using HQL worldwide. AND table_name NOT LIKE ‘history%’; Powered by Discourse, best viewed with JavaScript enabled, Why doesn't this work? What is the difference between partitioning and bucketing a table in Hive ? There is nothing like SHOW VIEWS in Hive. Can I use a MacBook as a server with the lid closed? If no database is specified then the tables are returned from the current database. Any thoughts on this? Well my question is simple - I want to exclude tables with a certain prefix using this: With the prefix obviously being ‘history’. Like any other SQL, the default ordering is asc. On Hive 1.1.0 the following query executes for one hour & the table has nearly 2 billion records. Internal tables. Additionally, the output of this statement may be filtered by an optional matching pattern. The table we create in any database will be stored in the sub-directory of that database. If you have a partitioned table on Hive and the location of each partition file is different, you can get each partition file location from HDFS using the below command. HIVE-1676; show table extended like does not work well with wildcards. Is it feasible to circumnavigate the Earth in a sailplane? Why would a Cloaking Device be a technology the Federation could not have developed on its own? The article describes the Hive Data Definition Language(DDL) commands for performing various operations like creating a table/database in Hive, dropping a table/database in Hive, altering a table/database in Hive, etc. 1. Additionally, the output of this statement may be filtered by an optional matching pattern. For example, the following USE statement tells Drill that youonly want information from the dfs.myviewsschema: In this example, “myviews” is a workspace created within thedfsstorage plugin configuration. ... As evident from the output below though there are tables that match the wildcard, the output from "show table extended like " does not contain the matches. Dropping the table does not delete the data, although the metadata for the table will be deleted. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Next steps? Dec 20, 2020 ; What is the purpose of shuffling and sorting phase in the reducer in Map Reduce? In addition to using operators to create new columns, there are also many Hive built‐in functions that can be used. When you use a particular schema and then issue the SHOW TABLES command, Drillreturns the tables and views within that schema. The way of creating tables in the hive is very much similar to the way we create tables in SQL. Objective. DESCRIBE and DESCRIBE EXTENDED statements can be used for views like for tables, however, for DESCRIBE EXTENDED, the detailed table information has a variable named typeable which has value = ‘virtual view’ for views. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Returns all the tables for an optionally specified database. This website uses cookies and other tracking technology to analyse traffic, personalise ads and learn how we can improve the experience for our visitors and customers. rev 2021.3.12.38768, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide, Off course you do. Type: Bug Status: Resolved. Introduction to Hive Databases. behavior whereas SHOW TABLE EXTENDED does not: hive> SHOW TABLES "pokes*" ; OK pokes hive> SHOW TABLE EXTENDED LIKE "pokes*" ; FAILED: Error in metadata: MetaException (message:Got exception: javax.jdo.JDOUserException ')' expected at character 54 in "database.name == dbName && ( … Q 19 - The difference between the MAP and STRUCT data type in Hive is. In this recipe, you will learn how to list tables in Hive.This command lists all the tables and views in a database. The WITH DBPROPERTIES clause was added in Hive 0.7 ().MANAGEDLOCATION was added to database in Hive 4.0.0 ().LOCATION now refers to the default directory for external tables and MANAGEDLOCATION refers to the default directory for managed tables. If we run create table command and that table is already present then Hive will throw an error. This is where the Metadata details for all the Hive tables are stored.

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