Set the Schema as Built-in and click Edit
schema to define the data structure of the database table to
read data from.
Click the [+] button to add the rows that
you will use to define the schema, three columns in this example
id, firstName, and
lastName.
Under Column, click in the fields to enter the
corresponding column names.
Click the field under Type to define the type of
data.
Click OK to close the schema editor.