As of current version Hadoop Hive does not supports rename of existing database. Hi@akhtar, You can rename the table name in the hive. With the Hive Metastore integration disabled, Kudu presents tables as a single flat namespace, with no hierarchy or concept of a database. The table is storing the records or data in tabular format. $ ALTER TABLE name RENAME … Syntax: PARTITION (partition_col_name = partition_col_val [,...]) Here, we are changing the name of the column by using the following signature: - Alter table table_name change old_column_name new_column_name datatype; Let's see the existing schema of the table. Does this mean we can have our partitions at diffrent locations? Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. In Hive, we can rename a column, change its type and position. The syntax of this command is as follows. The following queries rename the column name and column data type using the above data: Below is the syntax to rename a Hive Partition alter table table_name PARTITION (col = ‘value’) RENAME TO PARTITION (col = ‘new_value’); alter table int_test partition (country = 'USA') rename to partition (country = 'United States of America') Hive is metastore for tables. Your email address will not be published. table_name. 1.2 Example for Rename table in Hive Alter table statement in Hive Alter table statement helps to change the structure of the table in Hive. The following table contains the fields of employeetable and it shows the fields to be changed (in bold). flag; ask related question Related Questions In Big Data Hadoop 0 votes. Use the following commands to compile and execute this program. Save the program in a file named HiveAlterChangeColumn.java. The following queries rename the column name and column data type using the above data: Given below is the JDBC program to change a column. This article explains how to rename a database in Hive manually without modifying database locations, as the command: ALTER DATABASE test_db RENAME TO test_db_new; still does not work due to HIVE-4847 is not fixed yet. ALTER TABLE in Hive. Hello, What is the best way to rename a hive database that contains managed tables, external tables, partitionned tables and views? comment. I want to rename a Hive table if it exists, and not generate an error if it doesn't. The ALTER TABLE statement changes the structure or properties of an existing Impala table.. This operation does not support moving tables across databases. 5. ]new_table_name Rename an existing table or view. Not just in different locations but also in different file systems. The old table prime_customer doesn’t exist in Hive and renamed table prime_cusomer_bkup has the records as shown below. Alter table statement helps to change the structure of the table in Hive. Required fields are marked *, //test_env/apps/hive/warehouse/test_db.db/prime_customer, //test_env/apps/hive/warehouse/test_db.db/prime_customer_bkup. In the hive, the tables are consisting of columns and rows and store the related data in the table format within the same database. table_name. Learning Computer Science and Programming, Write an article about any topics in Teradata/Hive and send it to Regexp_extract function in Hive with examples, How to create a file in vim editor and save/exit the editor. Re: Copying the Hive External table … Partition to be renamed. I need something like. Below is the example of drop database in Hive: hive> drop database test_db; OK Time taken: 1.474 seconds Hadoop Hive Rename Database Command. To rename a table (RENAME TO clause): The RENAME TO clause lets you change the name of an existing table, and optionally which database it is located in. Now i wanted to rename the partition which I have did by using . It allows us to rename the table,add columns/partitions,rename columns/partitions and so on in Hive table.Hive versions prior to 0.6 just renamed the table in the metastore without moving the HDFS location. You need to use the alter command. A table name, optionally qualified with a database name. Once it’s available we can do it as shown below: Your email address will not be published. Of course we can. If the table is partitioned the columns gets added at the end but before the … 2. Most ALTER TABLE operations do not actually rewrite, move, and so on the actual data files. add or replace hive column Using ADD you can add columns at the end of existing columns. This command allows you to change the table name as shown below. ALTER TABLE IF EXISTS t1 RENAME TO t2; but this doesn't run ("cannot recognize input near 'if' 'exists' 'rename' in alter table statement"), and neither do the variations that I've tried. We can expect this feature in any of the later releases. We are telling hive this partition for this table is has its data at this location. However, the Hive offers a lot of flexibility while creating tables from where to store data to which format to use store data. For the DB rename to work properly, we need to update three tables in the HMS DB. 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 with RENAME is used to change the name of an already existing table in the hive. If a particular property was already set, this overrides the old value with the new one. Table names and column names are case insensitive but SerDe and property names are case sensitive. If you create a temporary table in Hive with the same name as a permanent table that already exists in the database, then within that session any references to that permanent table will resolve to the temporary table, rather than to the permanent table. import java.sql.SQLException; import java.sql.Connection; import java.sql.ResultSet; import java.sql.Statement; import java.sql.DriverManager; public class HiveAlterRenameTo { private static String driverName = "org.apache.hadoop.hive.jdbc.HiveDriver"; … After that the table disappeared form the gui of HUE (sqoop table list, metastore list) but the actual files of the table were not deleted from the HDFS. ALTER TABLE table_name RENAME TO new_table_name; This statement lets you change the name of a table to a different name. hive> create table partition_test (> name string, > age int) > partitioned by (year string, day string); OK Time taken: 5.35 seconds hive> Now … In this example, we will rename the prime_customer table to prime_customer_bkup in Hive. HDP version: 2.6. In this recipe, you will learn how to rename a table in Hive.The renaming command renames the old table name with a new table name. Create a partitioned table. partition_spec. The tables are broadly classified into two parts i.e. We can call this one as data on schema. The following query renames the table from employee to emp. The following query deletes all the columns from the employee table and replaces it with emp and name columns: Given below is the JDBC program to replace eid column with empid and ename column with name. Syntax to Rename a table: ALTER TABLE table_name RENAME TO new_table_name; DDL ALTER TABLE name Example: The statement takes any of the following syntaxes based on what attributes we wish to modify in a table. ALTER TABLE SET command is used for setting the SERDE or SERDE properties in Hive tables. 2. Use the following commands to compile and execute this program. ]table_name RENAME TO [db_name. It allows us to rename the table,add columns/partitions,rename columns/partitions and so on in Hive table.Hive versions prior to 0.6 just renamed the table in the metastore without moving the HDFS location. If the destination table name already exists, an exception is thrown. Turn on suggestions . Use the following commands to compile and execute this program. Syntax: [database_name.] The JDBC program to rename a table is as follows. hive> ALTER TABLE employee RENAME TO emp; JDBC-Programm. Using the ALTER TABLE statement we can rename the table, add columns to the table, change the table properties, etc. Creating a Hive table is similar like creating a table in SQL like databases. ALTER [TABLE|VIEW] [db_name. Internal tables. Rename Hive Partition. But the later version moves its HDFS location if you rename on a managed table.eval(ez_write_tag([[580,400],'revisitclass_com-medrectangle-3','ezslot_4',118,'0','0'])); As mentioned in the syntax, mention your current table name after the ALTER TABLE command and specify the new table name after the RENAME TO command. When I have a table at my sqoop schema and want to delete it, I go to HIVE editor (through HUE) and key in the following command DROP TABLE IF EXISTS schemaName.tblName PURGE;. Yes, you can rename a table in hive using the following command below: Alter Table table_name RENAME TO new_name. In this Apache Hive Jira HIVE-4847, you can see this is a new feature and the patch is available but it is yet to be merged and tagged to a particular release. In Hive 0.12 and earlier, only alphanumeric and underscore characters are … I have inserted data for one partitions say for example that particular hive table has partition (load_date='2017-11-09'). Here we are adding new information about partition to table metadata. From the output of describe formatted command, we can see that the HDFS location of the table is hdfs://test_env/apps/hive/warehouse/test_db.db/prime_customer. HIVE ALTER Table Syntax hive> ALTER TABLE emp RENAME TO employee;--Rename Table Name hive> ALTER TABLE emp CHANGE name firstname String;--Rename Column Name hive> ALTER TABLE emp CHANGE sal sal Double; -- Rename data types hive> ALTER TABLE emp ADD COLUMNS (dno INT COMMENT 'Department number'); -- Add column name hive> ALTER TABLE emp REPLACE COLUMNS … Internal Table is tightly coupled in nature.In this type of table, first we have to create table and load the data. Introduction to Hive Table. Save the program in a file named HiveAlterReplaceColumn.java. For internal tables, this operation physically renames the directory within HDFS that contains the data files; the original directory name no longer exists. The prime_customer table has the below customer details in the test_db database.eval(ez_write_tag([[336,280],'revisitclass_com-medrectangle-4','ezslot_2',119,'0','0'])); This table is created as managed table in Hive. The following query adds a column named dept to the employee table. Additionally, Kudu’s only restriction on table names is that they be a valid UTF-8 encoded string. Also it changed the HDFS location of the file from hdfs://test_env/apps/hive/warehouse/test_db.db/prime_customer to hdfs://test_env/apps/hive/warehouse/test_db.db/prime_customer_bkup. 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 columns. hive> ALTER TABLE employee > ADD PARTITION (year=’2012’) > location '/2012/part2012'; Renaming a Partition. Save the program in a file named HiveAlterAddColumn.java. The following table contains the fields of employee table and it shows the fields to be changed (in bold). Der JDBC-Programm zum Umbenennen eine Tabelle ist wie folgt. Below are the differences between Hive Temporary table vs Regular permanent table The ALTER TABLE statement in Hive enables you to change the structure of an existing table. To drop the tables in the database as well, use DROP DATABASE … with CASCADE option. In Impala, this is primarily a logical operation that updates the table metadata in the metastore database that Impala shares with Hive. 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. The JDBC program to add a column to a table is given below. [email protected]. answered Jun 25, 2019 by Gitika • 65,870 points . Hive Temporary Table vs Regular Table. 1 answer. Use the following commands to compile and execute this program. Lets see the structure of the table and its HDFS location before renaming the table. Simply so, can a table be renamed in hive? The below example rename partition state=’AL’ to state=’NY’ jdbc:hive2://127.0.0.1:10000> ALTER TABLE zipcodes PARTITION (state='AL') RENAME TO PARTITION (state='NY'); Manually Renaming Partitions on HDFS Let’s look at an example that uses the ALTER TABLE statement to rename the table. Save the program in a file named HiveAlterRenameTo.java. You can also use ALTER TABLE with PARTITION RENAME to rename the Hive partition. In this blog, we will discuss many of these options and different operations that we can perform on Hive tables. ; external table and internal table. Support Questions Find answers, ask questions, and share your expertise cancel. The Alter table statement has successfully renamed the table from prime_customer to prime_customer_bkup in Hive. Subsequently, question is, how do I copy a table from one database to another in Hive? (Older Hive versions just renamed the table in the metastore without moving the HDFS location.) How to create a managed table in Hive… Recently I received a requirement to rename hive database, however current Apache hive release doesn’t support this feature.
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