How can Hive merge or write query results into a target table?
You can use either the INSERT OVERWRITE statement or the INSERT INTO statement to overwrite or write query results to the target table.
- Utilize the INSERT OVERWRITE statement.
Create a new table called target_table and populate it with the data from source_table that meets the specified condition.
The statement above selects records that meet the conditions from the source_table and writes them into the target_table.
- Use the INSERT INTO statement.
Add the contents of the source table into the target table based on the specified condition.
The mentioned statement will select records from the source_table that meet the conditions, and then append them to the target_table.
Note: When using the INSERT OVERWRITE or INSERT INTO statement, the target_table must already exist, and the table structure must be consistent with the query result. If the target table does not exist, you can first use the CREATE TABLE statement to create the target table.
