Can we create temp tables in Hive?

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Can we create temp tables in Hive?

Temporary table data persists only during the current Apache Hive session. Hive drops the table at the end of the session. You can create a temporary table having the same name as another user’s temporary table because user sessions are independent. Temporary tables do not support partitioned columns and indexes.

Can we have multiple table schema in Hive?

3 Answers. Yes, we can have multiple hive tables with the same underlying HDFS directory.

How do I create a non transactional table in Hive?

create table bkp_table as select * from your_table; Then drop table and create again without transactional property. Reload data from backup. Or make a new table, load data from old one, delete old, rename new.

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What is the use of temporary table in Hive?

A temporary table is a convenient way for an application to automatically manage intermediate data generated during a large or complex query execution. Hive 0.14 onward supports temporary tables. You can use them as a normal table within a user session.

What is CTE in hive?

A Common Table Expression (CTE) is a temporary result set derived from a simple query specified in a WITH clause, which immediately precedes a SELECT or INSERT keyword. One or more CTEs can be used in a Hive SELECT, INSERT, CREATE TABLE AS SELECT, or CREATE VIEW AS SELECT statement.

What is an external table in hive?

An external table is a table for which Hive does not manage storage. If you delete an external table, only the definition in Hive is deleted. The data remains. An internal table is a table that Hive manages.

How do you create an ACID table in Hive?

Conclusion

  1. Enable ACID Transaction Manager (DbTxnManager) on hive session.
  2. Enable Concurrency.
  3. Create Table by enabling transactional (TBLPROPERTIES (‘transactional’=’true’))
  4. Create Table with ORC storage type.
  5. Insert data into a table using INSERT INTO.
  6. Finally, Run UPDATE and DELETE HiveQL queries on the table.
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Does CTE create a temp table?

CTE stands for Common Table Expressions. It was introduced with SQL Server 2005. It is a temporary result set and typically it may be a result of complex sub-query. Unlike the temporary table, its life is limited to the current query.

Does Hive support recursive CTE?

Hive support with clause, but hive does not support Recursive Queries.