copy table from ' .csv' with delimiter ',' null as '';

To copy a table from a CSV file with a comma delimiter and treating empty fields as null, you can use the following command in most SQL databases:

COPY table_name FROM 'path/to/file.csv' DELIMITER ',' NULL AS '';

Replace `table_name` with the name of the table you want to copy the data into, and `'path/to/file.csv'` with the actual file path of your CSV file. The `DELIMITER ','` specifies that the fields in the CSV file are separated by commas. The `NULL AS ''` statement instructs the database to treat empty fields as null values.

Please note that the exact syntax may vary slightly depending on the database you are using.