How do I rename a table column in Hive?

How do I rename a table column in Hive?

Hive – Alter Table

1. Renaming Table Name. ALTER TABLE with RENAME is used to change the name of an already existing table in the hive. Syntax:
2. ADD Columns. Syntax:
3. CHANGE Column. CHANGE in ALTER TABLE is used to change the name or data type of an existing column or attribute.
4. REPLACE Column.

How do I rename a Hive database?

We can also alter the database as below.

1. Alter in Database Properties. Example: ALTER ( DATABASE | SCHEMA ) database name SET database properties ( property name = property value, );
2. Alter the Owner. Example: ALTER (DATABASE| SCHEMA) database name SET OWNER [USER|ROLE ] user or role ;
3. Alter the HDFS Location.

Can we alter table in Hive?

In Hive, we can perform modifications in the existing table like changing the table name, column name, comments, and table properties. It provides SQL like commands to alter the table.

How do I update a Hive table?

How to update Hive Table without Setting Table Properties?

1. Use Temporary Hive Table to Update Table.
2. Set TBLPROPERTIES to enable ACID transactions on Hive Tables.
3. Use HBase to update records and create Hive External table to display HBase Table data.

How do I find my current hive database name?

current. db=true will show the current DB for current hive session only, but if we update the . hiverc file with the above property will keep showing the current db for all the sessions.

How do I change the database in hive?

DDL statements are used to build and modify the tables and other objects in the database. Go to Hive shell by giving the command sudo hive and enter the command ‘create database>’ to create the new database in the Hive. To list out the databases in Hive warehouse, enter the command ‘show databases’.

How do I change table properties in Hive?

Changing Hive table properties

1. Select the table you want to change and click View. The default Columns tab shows the table’s columns.
2. Click the Properties tab.
3. In the Table Parameters section, locate the skipAutoProvisioning property and (if it exists) verify that its value is set to “true”.

Can we update Hive external table?

There are many approaches that you can follow to update Hive tables, such as:

• Use Temporary Hive Table to Update Table.
• Set TBLPROPERTIES to enable ACID transactions on Hive Tables.
• Use HBase to update records and create Hive External table to display HBase Table data.

Which version of Hive supports update?

Since Hive Version 0.14, Hive supports ACID transactions like delete and update records/rows on Table with similar syntax as traditional SQL queries. You need to enable Hive ACID support and create a transactional table.

How do I find my hive database details?

To list out the databases in Hive warehouse, enter the command ‘show databases’. The database creates in a default location of the Hive warehouse. In Cloudera, Hive database store in a /user/hive/warehouse. Copy the input data to HDFS from local by using the copy From Local command.

How do I see table statements in hive?

Use the following commands to show CREATE TABLE in Hive:

1. This command will show the CREATE TABLE statement for the Sales table: Show create table Sales; Copy.
2. This command will show the CREATE TABLE statement for the Sales table under the Hive_learning database: Show create table Hive_learning.Sales; Copy.

How do I rename an existing table?

The first one uses the ALTER TABLE syntax:

1. ALTER TABLE old_table_name RENAME new_table_name; The second way is to use RENAME TABLE :
2. RENAME TABLE old_table_name TO new_table_name; RENAME TABLE offers more flexibility.
3. RENAME TABLE products TO products_old, products_new TO products;