DCOUNTA

Database Functions:
Function: DCOUNTA() - Counts the cells in a set of database records that match criteria.
Database

     +--------+--------+-----+-------+--------+
     | A      | B      | C   | D     | E      |
+----+--------+--------+-----+-------+--------+
|  4 | Tree   | Height | Age | Yield | Profit |
|  5 | Apple  | 18     | 20  | 14    | 105    |
|  6 | Pear   | 12     | 12  | 10    | 96     |
|  7 | Cherry | 13     | 14  | 9     | 105    |
|  8 | Apple  | 14     | N/A | 10    | 75     |
|  9 | Pear   | 9      | 8   | 8     | 77     |
| 10 | Apple  | 12     | 11  | 6     | 45     |
+----+--------+--------+-----+-------+--------+

Criteria

    +--------+--------+-----+-------+--------+--------+
    | A      | B      | C   | D     | E      | F      |
+---+--------+--------+-----+-------+--------+--------+
| 1 | Tree   | Height | Age | Yield | Profit | Height |
| 2 | =Apple | >10    |     |       |        | <16    |
+---+--------+--------+-----+-------+--------+--------+

The Number of Apple trees between 10' and 16' in height
=DCOUNTA(A4:E10,"Age",A1:F2)
DCOUNTA() Result is 2
Criteria

    +--------+
    | A      |
+---+--------+
| 1 | Tree   |
| 2 | =Apple |
| 3 | =Pear  |
+---+--------+

The Number of Apple and Pear trees in the orchard
=DCOUNTA(A4:E10,3,A1:A3)
DCOUNTA() Result is 5