The CSV engine stores data in the .csv file type using the comma-separated values format. This engine extracts data from the database and copies it to .csv out of the database. If you create a CSV file from the spreadsheet and copy it into the MYSQL data folder server, it can read the data using the select query. Similarly, if you write data in the table, an external program can read it from the CSV file. This storage engine is used for the exchange of data between software or applications. A CSV table does not support indexing and partitioning. All columns in the CSV storage engine need to be defined with the NOT NULL attribute to avoid errors during table creation.