How to perform a JOIN operation in Hive?

7 months ago

1 minute

The steps to execute a JOIN operation in Hive are as follows:

Write an appropriate SELECT statement that includes the tables to be joined and the join conditions. For example:

SELECT * 
FROM table1
JOIN table2
ON table1.column_name = table2.column_name;

Save the above SELECT statement as a Hive script file (.hql file).
Open the Hive terminal and log in to Hive.
Run the Hive script file using the following command:

source /path/to/your/file.hql;

The Hive will perform a JOIN operation and return the results.

Before performing the JOIN operation, make sure that the columns to be joined in both tables have the same data type, and preprocess the tables appropriately (such as removing duplicates or filtering) before joining.