Begin by logging into your Snapchat Marketing account. Navigate to the analytics or reporting section, where you can access the data you want to export. Look for an option to download your data, typically available in a CSV format. Ensure you select the correct data range and metrics relevant to your needs before exporting.

Once you have your CSV file, open it using a spreadsheet program (like Microsoft Excel or Google Sheets) to review and clean the data. Remove any unnecessary columns and ensure that all data entries are correct and consistent. Pay special attention to the format of dates and numbers, as these need to be compatible with MySQL data types.

Access your MySQL database using a client like MySQL Workbench or a command-line interface. Create a new database if one does not exist, and then set up a table that matches the structure of your CSV file. Ensure each column in your table has the correct data type to accommodate the data from the CSV file.

```sql
CREATE DATABASE snapchat_data;
USE snapchat_data;
CREATE TABLE campaign_data (
id INT AUTO_INCREMENT PRIMARY KEY,
campaign_name VARCHAR(255),
impressions INT,
clicks INT,
spend DECIMAL(10, 2),
date DATE
);
```

Use a script or tool to convert the CSV data into SQL `INSERT` statements. This can be done using a simple Python or Bash script that reads each line of the CSV and outputs an SQL query string. Ensure that each value is properly quoted and escaped to prevent SQL injection or errors.

Execute the SQL `INSERT` statements generated in the previous step on your MySQL database. This can be done directly through the MySQL client by pasting the statements into the console or using a script to run the queries. Ensure that your MySQL server is configured to accept connections and that you have the necessary permissions.

After inserting the data, run queries on your MySQL database to verify that the data has been correctly imported. Check for discrepancies in the number of records, data types, and any potential errors that may have occurred during the insertion process. This step is crucial to ensure that the data is complete and accurate.

To streamline future data transfers, consider writing a script in Python or another programming language that automates the entire process: exporting data, converting it to SQL, and inserting it into MySQL. This script can be scheduled to run at regular intervals using cron jobs or task schedulers, ensuring that your MySQL database stays updated with the latest Snapchat Marketing data.

By following these steps, you can efficiently transfer data from Snapchat Marketing to a MySQL destination without relying on third-party connectors or integrations.