Can We Update Hive External Table?

How can you tell if a table is external in hive?

For external tables Hive assumes that it does not manage the data.

Managed or external tables can be identified using the DESCRIBE FORMATTED table_name command, which will display either MANAGED_TABLE or EXTERNAL_TABLE depending on table type..

What is external table hive?

External tables are tables where Hive has loose coupling with the data. All the write operations to the Managed tables are performed using Hive SQL commands. … If an External table or partition is dropped, only the metadata associated with the table or partition is deleted but the underlying data files stay intact.

What is target table in hive?

A Hive target can be an internal table or an external table. Internal Hive tables are managed by Hive and are also known as managed tables. External Hive tables are managed by an external source such as HDFS, Amazon S3, Azure Blob, WASB, or ADLS.

Can we create a view on a hive external table?

You can use Hive create view to create a virtual table based on the result-set of a complex SQL statement that may have multiple table joins. The CREATE VIEW statement lets you create a shorthand abbreviation for a more complex and complicated query. … Apache Hive Create External Tables and Examples.

When would you choose to create an external Hive table?

Use EXTERNAL tables when:The data is also used outside of Hive. … Data needs to remain in the underlying location even after a DROP TABLE. … You want to use a custom location such as ASV.Hive should not own data and control settings, dirs, etc., you have another program or process that will do those things.More items…•

Can we truncate external table in hive?

You can truncate internal and external Hive tables in the Hadoop environment. To truncate the entire Hive table, choose the option to truncate the target table.

Can we update table in hive?

Hive doesn’t support updates (or deletes), but it does support INSERT INTO, so it is possible to add new rows to an existing table. Delete has been recently added in Hive version 0.14 Deletes can only be performed on tables that support ACID Below is the link from Apache .

Can we alter external table in hive?

Table Operations such as Creation, Altering, and Dropping tables in Hive can be observed in this tutorial. In the Below screenshot, we are creating a table with columns and altering the table name.

How do I load data into an external table in hive?

csv file is moved into the HDFS names directory. Once the file is in HDFS, we first load the data as an external Hive table. Start a Hive shell by typing hive at the command prompt and enter the following commands.

How do I drop an external table in hive?

Do alter table on all tables and change the external table to internal table then drop the table. hive> drop table; //now the table is internal if you drop the table data will be dropped automatically.

How do I rename an external table in hive?

ALTER TABLE table_name RENAME TO new_table_name; This statement lets you change the name of a table to a different name. As of version 0.6, a rename on a managed table moves its HDFS location as well. (Older Hive versions just renamed the table in the metastore without moving the HDFS location.)

How can you tell if a table is partitioned in hive?

Use the following commands to show partitions in Hive:The following command will list all the partitions present in the Sales table: Show partitions Sales;The following command will list a specific partition of the Sales table: Show partitions Sales …