How can we modify data in a Hive table with impala?

1 year ago
Noah Thompson
2 minutes

To make changes to data in a Hive table, you can use Impala to achieve this through INSERT, UPDATE, or DELETE statements.

  1. Insert data: Use the INSERT statement to insert new data into a Hive table. For example:
  2. Add data into the specified table with the given values for each column.
  3. Replace table_name with the name of the table you want to insert data into, column1, column2, … with the names of the columns you want to insert data into, and value1, value2, … with the specific values you want to insert.
  4. Update the data: use the UPDATE statement to modify data in a Hive table. For example:
  5. Modify the values of column1 and column2 in the table ‘table_name’ based on the specified condition.
  6. Please replace table_name with the name of the table you want to update, column1, column2 with the names of the columns you want to update, new_value1, new_value2 with the new values you want to update to, and condition with the specified condition for the rows you want to update.
  7. Delete data: Use the DELETE statement to remove data from a Hive table. For example:
  8. Remove all entries from the table where the specified condition is met.
  9. Please replace “table_name” with the name of the table from which you want to delete data, and “condition” with the specified criteria for deleting rows.

Please note that Impala does not directly manipulate the data in Hive tables, but instead, it passes the operations to Hive for execution through corresponding queries. Therefore, before using Impala to modify data in a Hive table, make sure you have created the table in Hive.

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