Respuesta :

The function is Count.

There are many functions available on a database to do aggregated calculations. So they can be referred as aggregate functions. The aggregate functions available are:

  • count: To get the the number of rows with a specified criteria.
  • sum: To get the sum of values on the selected cells.
  • max: To get the maximum value within a selected range of data.
  • min: To get the minimum value within a selected range of data.
  • avg: To get the average of the selected data.

As the field name referred here is 'lastname', the appropriate aggregate function would be count.

Learn more about count at https://brainly.com/question/15485178

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