Depends on how big you need.

General data is divided into Access, Mysql, Mssql and large-scale SQLSEVER database

As mentioned above, Access is generally free. You can use it by uploading the database after applying for space.

MySQL requires a fee. Generally, a 20M MYSQL database space costs 10-30 yuan.

SQLSever database is relatively expensive. It is recommended to use foreign providers. Generally, 50M costs 5-10 US dollars.