An easy method to import and export database tables uses Calc as a "helper application".
You copy a table from Base to a new Calc sheet, then you can save or export the data to any file format that Calc supports.
Now you can save or export the data to many file types.
You can import text files, spreadsheet files, and your system address book in read-only mode only.
When you import from a text or spreadsheet file, the file must have a first row of header information. The second row of the file is the first valid data row. The format of every field in the second row determines the format for the entire column. Any format information from a spreadsheet file gets lost when importing to Base.
For example, to ensure the first column has a text format, you must make sure that the first field of the first valid data row contains text. If a field in the first valid data row contains a number, the whole column is set to number format, and only numbers, no text, will be shown in that column.
On Windows systems, you can also use drag-and-drop instead of Copy and Paste. Also, for registered databases, you can open the datasource browser (press Command Ctrl + Shift + F4 keys) instead of opening the Base window.