How to export data files from mysql?

In MySQL, data can be exported to a file using the SELECT … INTO OUTFILE statement.

The specific steps are as follows:

1. Open the MySQL client or connect to the MySQL database using a command line tool.
2. Switch to the database named database_name.
3. Save all data from the table into a CSV file with the specified path, using comma as field delimiter and newline as line terminator.
4. The name of the table
5. The name of the file is filename.csv.
6. When executing the query statement, the data will be exported to the specified file.

It is important to note that the MySQL user performing the export operation needs to have permission to write files, and the specified file path should be writable.