create dynamic partition in hive

To create a dynamic partition in Hive, you can use the following steps:

1. Create an external table in Hive with the columns you want to partition on.
2. Add the partition columns to the table schema.
3. Load data into the table.
4. Use the INSERT statement with the `INSERT OVERWRITE` clause to insert data into the table and create partitions dynamically based on the values in the partition columns.

Here is an example of creating a dynamic partition on a table in Hive:

CREATE EXTERNAL TABLE my_table (
    column1 STRING,
    column2 INT
)
PARTITIONED BY (partition_col STRING)
ROW FORMAT DELIMITED
FIELDS TERMINATED BY ','
LOCATION '/path/to/my_table';

-- Load data into the table
LOAD DATA INPATH '/path/to/data'
OVERWRITE INTO TABLE my_table;

-- Insert data into the table and create partitions dynamically
INSERT OVERWRITE TABLE my_table PARTITION (partition_col)
SELECT column1, column2, partition_col
FROM my_table;

In this example, we create an external table called `my_table` with the columns `column1` and `column2`. We also add a partition column called `partition_col` to the table schema. We then load data into the table and use the `INSERT OVERWRITE` clause with the `PARTITION` keyword to insert data into the table and create partitions dynamically based on the values in the `partition_col` column. The `SELECT` statement selects the columns from `my_table` and also includes the `partition_col` column to dynamically create partitions.