What will happen when a database in dropped in hive?

What will happen when a database in dropped in hive?

Drop Database is a statement that drops all the tables and deletes the database.

How do I drop multiple databases in hive?

1 Answer. hive> drop databases like ‘s*’;

How do you drop a database from a table?

To delete a table from the database

1. In Object Explorer, select the table you want to delete.
2. Right-click the table and choose Delete from the shortcut menu.
3. A message box prompts you to confirm the deletion. Click Yes. Deleting a table automatically removes any relationships to it.

How do I drop an external hive with data?

Drop an external table along with data

1. Create a CSV file of data you want to query in Hive.
2. Start Hive.
3. Run DROP TABLE on the external table. DROP TABLE names_text;
4. Prevent data in external table from being deleted by a DROP TABLE statement. ALTER TABLE addresses_text SET TBLPROPERTIES (‘external.table.purge’=’false’);

What happens when you drop and an external table in hive?

External tables are stored outside the warehouse directory. They can access data stored in sources such as remote HDFS locations or Azure Storage Volumes. Whenever we drop the external table, then only the metadata associated with the table will get deleted, the table data remains untouched by Hive.

What happens when managed table is dropped in hive?

Managed Table/Internal Table. In Hive,” user/hive/warehouse” is the default directory. We do not have to provide the location manually while creating the table. “Drop table” command deletes the data permanently.

How do I drop a partition in hive?

Drop or Delete Hive Partition Hive drop or delete partition is performed using ALTER TABLE tablename DROP command. Dropping a partition from a table removes the data from HDFS and from Hive Metastore.

How do I drop a database in mysql?

To do delete a database you need the command ‘DROP DATABASE’. The syntax is similar to creating a database. ‘DROP DATABASE ;’, where is the name of the database you want to delete.

How do I drop a database in SQL Server?

Using SQL Server Management Studio

1. In Object Explorer, connect to an instance of the SQL Server Database Engine, and then expand that instance.
2. Expand Databases, right-click the database to delete, and then click Delete.
3. Confirm the correct database is selected, and then click OK.

What is drop command in SQL?

The SQL DROP command is used to remove an object from the database. If you drop a table, all the rows in the table is deleted and the table structure is removed from the database. Once a table is dropped we cannot get it back, so be careful while using DROP command.

How do I drop data from an external table?

How do I drop an external table in SQL Server?

1. Syntax. syntaxsql Copy. DROP EXTERNAL TABLE { database_name.
2. Arguments. [ database_name . [ schema_name] .
3. Permissions. Requires: ALTER permission on the schema to which the table belongs.
4. Remarks. Dropping an external table removes all table-related metadata.
5. Examples. A.
6. See Also. CREATE EXTERNAL TABLE (Transact-SQL)

Is there a way to drop the database in hive?

In Hive, it is not allowed to drop the database that contains the tables directly. In such a case, we can drop the database either by dropping tables first or use Cascade keyword with the command. This command automatically drops the tables present in the database first. Help Others, Please Share.

What are the optional clauses in hive drop table?

Hive DROP DATABASE consists of several optional clauses, using these we can change the behavior of the Hive statements. IF EXISTS – Use IF EXISTS to check if the database exists before running a drop database statement. RESTRICT – The default behavior is RESTRICT, where DROP DATABASE will fail if the database is not empty.

Can you use databse and schema in hive?

DATABSE and SCHEMA can be used interchangeably in Hive as both refer to the same. In this article, I am using DATABASE but you can use SCHEMA instead. Below example drops an employee table from Hive metastore. If the table exists in a database, specify the database name.

Which is the default database in hive server?

Note: The Hive server or service is containing the default database. The default database name is “default”. While creating the table, we forget to specify which hive database we need to create the database. Then by default, the tables will create in the “default” database.