hive-overwrite
时间: 2023-08-19 15:09:41 浏览: 80
Hive's `OVERWRITE` keyword is used in conjunction with the `INSERT INTO` statement to overwrite the existing data in a table with new data. When you use `INSERT OVERWRITE` in Hive, it replaces the existing data in the target table with the new data specified in the query.
Here's an example of how you can use `INSERT OVERWRITE` in Hive:
```sql
INSERT OVERWRITE TABLE my_table
SELECT col1, col2, col3
FROM source_table
WHERE condition;
```
In this example, the data selected from the `source_table` will be inserted into `my_table`, overwriting any existing data in `my_table`.
Please note that using `INSERT OVERWRITE` can be a destructive operation, as it permanently removes the existing data. So, it's important to use it with caution and make sure you have a backup of the data if needed.