To add partitions to a Hive table, you can use the ALTER TABLE statement with the ADD PARTITION clause. The ADD PARTITION clause allows you to create a new partition and specify its partition column values. Here’s an example: Suppose you have a sales table partitioned by year and month, and you want to add …
Section 8:78.Adding Partitions to Tables in Hive Read More »
Partitioning in Hive is a technique for dividing large tables into smaller, more manageable parts based on specific column values. Partitioning can improve query performance and reduce data processing time by allowing the system to scan only the relevant data rather than scanning the entire table. To partition a table in Hive, follow these steps: …
Section 8:77.Creating Partitioned table in Hive – order_part with order_month as key Read More »
In Hive, you can use a stage table to insert data into a target table. A stage table is a temporary table that you create to hold the data that you want to insert into the target table. You can then use the INSERT INTO statement to insert the data from the stage table into …
Section 8:75.Inserting Data into order_items using stage table Read More »
Read data from files Convert into collection Perform collection operations to preview the data Run map reduce operations
Here is the link for git repository.
Map Filter Reduce
