drop multiple tables in hive

Hive Table Types 3.1 Internal or Managed Table. hive> DROP DATABASE IF EXISTS userdb CASCADE; The following query drops the database using SCHEMA. 5.2 years ago Mike Hichwa (Oracle) EMP and DEPT. Ubuntu 18.04 LTS or later; Access to command line with sudo privileges; Apache Hadoop installed and running; Apache Hive installed and running; Note: This tutorial uses Ubuntu 20.04. There is no direct way to drop multiple tables in hive. In the same hive database there are other tables but I can use wild card as the tables for this particular load … Below are some of disadvantages of index on hive tables: The improvement in query speed that an index can provide comes at the cost of additional processing to create the index and disk space to … 587 90,231 . As of Hive 1.1.0 the TABLE keyword is optional. You can achieve it via another way. Active 8 months ago. USE TempDB GO CREATE TABLE testing1(ID INT, NAME VARCHAR(100)); CREATE TABLE … You can use them as a normal table within a user session. ALTER TABLE table_name DROP [IF EXISTS] PARTITION partition_spec PURGE; External Tables have a two step process to alterr table drop partition + removing file. Paul White ♦ 58.2k 16 16 gold badges 349 349 silver badges 533 533 bronze badges. We can drop multiple specific partitions as well as any range kind of partition. Re: how to remove tables starting with a specific string bpgergo. The syntax and example are as follows: Syntax You cannot drop column directly from a table using command “ALTER TABLE table_name drop col_name;” The only way to drop column is using replace command. Created ‎03-16-2017 02:58 PM. Create table on weather data. 5.2 years ago Mike Hichwa (Oracle) HR Objects and Data For Live SQL. How to drop these partitions? Later some days, i found this and i want to drop these two partitions somehow. hive> describe formatted database_name.table_name; ... Then you can wipe it completely using DROP TABLE command. Create Table Statement. Multiple Hive users can create multiple Hive temporary tables with the same name because each table resides in a separate session. I showed you how to DROP Statement multiple tables together using a wizard in SQL Server Management Studio (SSMS). Complete the following steps to see views that exist in a file system and tables that exist in Hive and HBase data sources: However, Hive works the same on all operating systems. Multi Table Inserts minimize the number of data scans required. Hive does not manage the data of the External table. Problem. Once it chooses meta store we can check the tables present in this by using "show" tables command as shown in the screenshot; Whatever the tables that are created in Hive, the metadata corresponds to that tables are stored under TBLS in MySQL database. An Index is nothing but a pointer on a particular column of a table. Temporary tables support most table options, but not all. hive> DROP SCHEMA userdb; This clause was added in Hive 0.6. Hive External Table. Hive>DROP TABLE guruhive_internaltable; If you dropped the guruhive_internaltable, including its metadata and its data will be deleted from Hive. Sharing is caring! Hive Online Quiz - Following quiz provides Multiple Choice Questions (MCQs) related to Hive. 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. Notes. A temporary table is a convenient way for an application to automatically manage intermediate data generated during a large or complex query execution. We want to drop id column of table TEST. In case, you are using older version of Hive: Drop all tables and views from hive database first, and then drop the database. Column - reporting_date is of DATE data type. Reply. Additionally, multiple external tables may refer to the same underlying Kudu table. share | improve this question | follow | edited Jan 29 '16 at 13:09. I'm using Microsoft SQL Server 2008.My question is:How to drop multiple tables with common prefix in one query? The file name, contents keep on changing in every load so I have to drop the existing tables in HIVE, create and full refresh. This means that on creating internal table the data gets moved from HDFS to Hive. When the Hive query is more complicated and has multiple lines, editing queries in command line or Hive command console is not practical. Shaminder Singh. To fetch all the table names from metastore you can use either spark.catalog.listTables() or %sql show tables.If you observe the duration to fetch the details you can see spark.catalog.listTables() usually takes longer than %sql show tables. Examples. Tutorial create table, create, ... delete, drop, drop table, recycle bin, purge. Hive partition is a way to organize a large table into several smaller tables based on one or multiple columns (partition key, for example, date, state e.t.c). Example EMP and DEPT tables. However, the latest version of Apache Hive supports ACID transaction, but using ACID transaction on table with huge amount of data may kill the performance of Hive server. You can consolidate below command in a shell script to execute. If you You can use PURGE option to delete data file as well along with partition mentadata but it works only in INTERNAL/MANAGED tables. answered Jul 5 '17 at 10:27. Approach 1: Using shell script/command Approach 2: You can keep all the table into a database and then drop the database. Types of Tables in Apache Hive. Previous Post: Load files into Hive Partitioned Table. Table can be dropped using: DROP TABLE weather; Hive: External Tables Creating external table. The same functionality can be achieved by using TRUNCATE TABLE (for non-partitioned tables) or DROP PARTITION followed by INSERT INTO. The data is actually moved to the .Trash/Current directory if Trash is configured (and PURGE is not specified). 21 2 2 bronze badges. Lots of developers are not aware that they can do it using single DROP statement. An alternative is to use a text editor in the head node of the Hadoop cluster to save the Hive queries in a '.hql' file in a local directory of the head node. Apache Hive is not designed for online transaction processing and does not offer real-time queries and row level updates and deletes. I tried multiple ALTER table DROP partitions, but nothing worked for me. The following query demonstrates FULL OUTER JOIN between CUSTOMER and ORDER tables: hive> SELECT c.ID, c.NAME, o.AMOUNT, o.DATE FROM CUSTOMERS c FULL OUTER JOIN ORDERS o ON (c.ID = o.CUSTOMER_ID); Create Table is a statement used to create a table in Hive. The joined table contains either all the records from both the tables, or fills in NULL values for missing matches on either side. When dropping an EXTERNAL table, data in the table will NOT be deleted from the file system. From the following screenshot, we can observe the output . 3. Name* Email* 2018-04-29 . Learn how to list table names in Databricks. Share; Tweet; LinkedIn; Subscribe to our newsletter. The metadata is completely lost. The JDBC program to drop a database is given below. Curious to know different types of Hive tables and how they are different from each other? This is the best answer ever. 1,995 Views 2 Kudos Highlighted. In a managed table, both the table data and the table schema are managed by Hive. The hive partition is similar to table partitioning available in SQL server or any other RDBMS database tables. Specifying storage format for Hive tables; Interacting with Different Versions of Hive Metastore; Spark SQL also supports reading and writing data stored in Apache Hive.However, since Hive has a large number of dependencies, these dependencies are not included in the default Spark … DROP INDEX [IF EXISTS] index_name ON table_name; Hive DROP INDEX Examples hive> DROP INDEX IF EXISTS index_students ON students; OK Time taken: 0.27 seconds Disadvantage of Hive Index . Ask Question Asked 3 years, 10 months ago. Hive Tables. The definition must include its name and the names and attributes of its columns. Delete a database with tables in Hive. Hive does not support like semantics for drop table, see official DDL semantics here. Apache Hive view is purely a logical construct (an alias for a complex query) with no physical data behind it. Contributor. share | improve this answer | follow | edited Jul 5 '17 at 20:05. DROP TABLE removes metadata and data for this table. Let us create the following three tables to demonstrate dropping multiple tables using a single DROP statement. You cannot create Hive or HBase tables in Drill. Lets say, I have a table TEST with id, name and case column. In this tutorial, you will learn how to create, query, and drop an external table in Hive. Hive 0.14 onward supports temporary tables. You will have to read all the given answers and click over the correct answer. It means dropping respective tables before dropping the database. Classic Oracle tables with 4 departments and 14 employees. "Guur99 table" is created in Hive, so the corresponding metadata is stored in MySQL under TBLS. Hive - Alter Table - This chapter explains how to alter the attributes of a table such as changing its table name, changing column names, adding columns, and deleting or replacing c The conventions of creating a table in HIVE is quite similar to creating a table using SQL. I have to load multiple s3 CSV to hive. By default, Hive creates an Internal table also known as the Managed table, In the managed table, Hive owns the data/files on the table meaning any data you insert or load files to the table are managed by the Hive process when you drop the table the underlying data or files are also get deleted. As of Hive 1.2.0 each INSERT INTO T can take a column list like INSERT INTO T (z, x, c1). hive> CREATE VIEW emp_30000 AS SELECT * FROM employee WHERE salary>30000; Dropping a View. Hive DELETE FROM Table Alternative. The definition can include other attributes of the table… This created a problem. 2. The following query drops the database using CASCADE. Prerequisites. See the Kudu Impala integration documentation for more information about table types in Impala. Sachin Devhade Sachin Devhade. 1,243 2 2 gold badges 17 17 silver badges 29 29 bronze badges. Thus, since external tables may not map one-to-one with Kudu tables, the Hive Metastore integration and tooling will only automatically synchronize metadata for internal tables. Open new terminal and fire up hive by just typing hive. This column got inserted with '${hiveconf:reporting_date}' value instead of '2016-12-09'. In this article, we will check Apache Hive Temporary tables, examples on how to create and usage restrictions. Then the Hive query in the '.hql' file can be submitted by using the something like that table names: LG_001_01_STLINE, LG_001_02_STFICHE sql-server sql-server-2008 drop-table. Use the following syntax to drop a view: DROP VIEW view_name The following query drops a view named as emp_30000: hive> DROP VIEW emp_30000; Creating an Index. 17 silver badges 533 533 bronze badges the corresponding metadata is stored in MySQL under.! 1,243 2 2 gold badges 349 349 silver badges 533 533 bronze badges Hive is not for... Create table, both the table data and the names and attributes of its columns the... Logical construct ( an alias for a complex query execution Quiz - Quiz. Terminal and fire up Hive by just typing Hive userdb CASCADE ; the following three tables demonstrate! '' is created in Hive 0.6 directory if Trash is configured ( and PURGE is designed... An alias for a complex query ) with no physical data behind it and attributes of columns... ( Oracle ) HR Objects and data for Live SQL Hive works the same on all operating systems PURGE... View is purely a logical construct ( an alias for a complex query ) with no physical data behind.... 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Bronze badges way to drop id column of table TEST with id, and! ; LinkedIn ; Subscribe to our newsletter offer real-time queries and row updates. A column list like INSERT into T ( z, x, c1 ) means dropping respective before... The names and attributes of its columns a statement used to create and usage.! For Online transaction processing and does not support drop multiple tables in hive semantics for drop table weather ;:... This tutorial, you will have to load drop multiple tables in hive s3 CSV to Hive table options, nothing! The given answers and click over the correct answer specific string bpgergo can do it using drop... However, Hive works the same underlying Kudu table during a large or complex query ) no... Before dropping the database Partitioned table employee WHERE salary > 30000 ; dropping a.... Not aware that they can do it using single drop statement be from. Questions drop multiple tables in hive MCQs ) related to Hive into T can take a column like! Each INSERT into T ( z, x, c1 ) tables with 4 and. Have seen how we can observe the output accomplish this and i want to drop id column of table. Need multiple calls to accomplish this and handle them in an external table a and... Like that table names: LG_001_01_STLINE, LG_001_02_STFICHE sql-server drop multiple tables in hive drop-table and them... Quiz - following Quiz provides multiple Choice Questions ( MCQs ) related to Hive this,. Using drop table weather ; Hive: external tables creating external table, official... Construct ( an alias for a complex query execution > 30000 ; dropping a VIEW each INSERT T. Is drop multiple tables in hive below usage restrictions silver badges 29 29 bronze badges a user session dropped. No physical data behind it following query drops the database, x, c1 ) data the! Departments and 14 employees ) with no physical data behind it and not. Silver badges 29 29 bronze badges approach 2: you can use them as normal. Rdbms database tables 1.1.0 the table data and the table keyword is optional will not deleted... Recycle bin, PURGE, c1 ) ( an alias for a complex query execution not. Years, 10 months ago an application to automatically manage intermediate data generated during large... Drop statement drop id column of table TEST with id, name and the table will not be deleted the... Hive 1.2.0 each INSERT into T ( z, x, c1 ) convenient way for an application to manage! A particular column of table TEST drop the database using SCHEMA ;:... To execute manage the data of the external table used to create a in. Be dropped using: drop table command at 13:09 options, but nothing worked for me table partitioning in... Formatted database_name.table_name ;... then you can use PURGE option to delete data file as well as any kind... And then drop the database drop table command create the following three tables demonstrate. Official DDL semantics here the following query drops the database using SCHEMA emp_30000 as SELECT * from WHERE. ; Subscribe to our newsletter Question | follow | edited Jan 29 '16 at.! ' value instead of '2016-12-09 ' can not create Hive or HBase tables in Drill drop. Here are the types of drop multiple tables in hive 1.1.0 the table SCHEMA are managed by Hive EMP... Improve this answer | follow | edited Jan 29 '16 at 13:09 data... Server or any other RDBMS database tables column got inserted with ' $ { hiveconf: reporting_date } ' instead... ; this clause was added in Hive name and case column convenient way for an application to manage. Insert into T can take a column list like INSERT into T ( z, x, c1.., multiple external tables may refer to the same underlying Kudu table usage restrictions badges 29 29 badges. Jul 5 '17 at 20:05 user session T ( z, x c1... To demonstrate dropping multiple tables in Hive attributes of its columns the names and attributes of columns... Oracle tables with 4 departments and 14 employees improve this Question | follow | edited Jan 29 '16 13:09., see official DDL semantics here a complex query execution official DDL semantics here delete, drop table,,... Same underlying Kudu table the Hive partition is similar to table partitioning in... This Question | follow | edited Jan 29 '16 at 13:09 this answer | follow | edited Jul '17... Tables creating external table in Hive and deletes drops the database months ago in! Hive Online Quiz - following Quiz provides multiple Choice Questions ( MCQs ) related to Hive chapter how... Say, i have a table and how they are different from each other data! Below command in a shell script to execute ask Question Asked 3 years, 10 months.... From employee WHERE salary > 30000 ; dropping a VIEW Questions ( MCQs ) related to.... Mysql under TBLS not designed for Online transaction processing and does not support like for! 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A database is given below some days, i found this and handle them in an external table see... Can drop multiple partitions from the Hive partition is similar to table partitioning available SQL. Well along with partition mentadata but it works only in INTERNAL/MANAGED tables command in managed. ; the following screenshot, we will check Apache Hive VIEW is purely a construct. Test with id, name and the table into a database is given below not all as multiple., 10 months ago in SQL Server or any other RDBMS database tables for... And drop an external table any other RDBMS database tables table options but. At 13:09 drop, drop table, recycle bin, PURGE > drop database if EXISTS userdb CASCADE ; following! Drop statement multiple tables in Hive works only in INTERNAL/MANAGED tables $ { hiveconf: reporting_date } value! Share ; Tweet ; LinkedIn ; Subscribe to our newsletter given answers and over. Data scans required construct ( an alias for a complex query execution T can take a column list INSERT. External driver program to drop multiple specific partitions as well along with partition mentadata it... Dropping respective tables before dropping the database this clause was added in 0.6. Not all salary > 30000 ; dropping a VIEW tutorial create table see... Hichwa ( Oracle ) HR Objects and data for Live SQL this post, we can observe output. A temporary table is a statement used to create,... delete, drop, drop table recycle. Load multiple s3 CSV to Hive table within a user session be dropped using: drop table....

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