readtext on unitext Columns Usage

You can use the readtext command to retrieve text, unitext, and image values for only a selected portion of a column’s data.

readtext requires the name of the table and column, the text pointer, a starting offset within the column, and the number of characters or bytes to retrieve. You cannot use readtext on text, unitext, or image columns in views.

For detailed information about using readtext with unitext columns, see the Reference Manual: Commands.