Table Operations such as Creation, Altering, and Dropping tables in Hive can be observed in this tutorial.. The ALTER TABLE statement in Hive enables you to change the structure of an existing table. An ALTER TABLE statement to rename an internal table will move all data files are moved into the new HDFS directory for the table. Hive - Alter Table. Hadoop_Bigdata. Note. 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 … Long story short: the location of a hive managed table is just metadata, if you update it hive will not find its data anymore. After creating the table you can move the data from hive table to HDFS with the help of this command: And you can check the table you have created in HDFS with the help of this command: Using partitions, we can query the portion of the data. Short story long: Hive ALTER TABLE command and Examples; Syntax. In Hive, we can perform modifications in the existing table like changing the table name, column name, comments, and table properties. Alter table statement in Hive. If the table is internal table, the table type field will contain MANAGED_TABLE. Alter table statement helps to change the structure of the table in Hive. Highlighted. Available in Databricks Runtime 7.0 and above. Unable to alter table in hive? ALTER TABLE ADD PARTITION in Hive. Creating table guru_sample with two column names such as "empid" and "empname" Posted on April 17, 2018 by This data guy. If we want to change the name of an existing table, we can rename that table by using the following signature: - Unable to alter table in hive? Syntax to Rename a table: ALTER TABLE table_name RENAME TO new_table_name; New Contributor. In addition, we can use the Alter table add partition command to add the new partitions for a table. Below is the Hive REPLACE column syntax: ALTER TABLE table_name REPLACE COLUMNS (col_name data_type); For example, if you want to remove customer_id column from the empty table, you can use ALTER TABLE … Sometimes ALTER TABLE statement changes the structure as well. ALTER TABLE does not actually rewrite, move, etc, on the actual data files. If a particular property was already set, If a particular property was already set, this overrides the old value with the new one. Instead use ALTER TABLE table_name ALTER COLUMN column_name DROP NOT NULL. Alter location of a Hive table. The ALTER TABLE statement changes properties of an existing table. Using the ALTER TABLE statement we can rename the table, add columns to the table, change the table properties, etc. REPLACE COLUMNS. Mark as New; Bookmark; Subscribe; Mute; Subscribe to RSS Feed; Permalink; Print; Email to a Friend; Report Inappropriate Content; Please help me with below error, 1. The Location field displays the path of the table directory as an HDFS URI. ALTER TABLE SET command is used for setting the SERDE or SERDE properties in Hive tables. Hive> DESCRIBE FORMATTED table_name. ALTER TABLE is a logical operation that updates the table metadata in the metastore database that shares with Hive. It provides SQL like commands to alter the table. You do need to physically move the data on hdfs yourself. In the Below screenshot, we are creating a table with columns and altering the table name. Sets the SERDE or SERDEPROPERTIES in Hive tables. Created ‎06-17-2014 04:45 AM. 1. Alternatively, this can be done one partition at a time using ALTER TABLE CHANGE COLUMN, by specifying one partition per statement (This is available in Hive 0.14 or later, with HIVE-7971. Alter table statement is used to change the table structure or properties of an existing table in Hive. Hey, Basically When we create a table in hive, it creates in the default location of the hive warehouse. 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