Using DCOUNT in Excel Database

DCOUNT counts the cells that contain numbers in a column of a list or database that match conditions you specify.

The Field argument is optional. If field is omitted, DCOUNT counts all records in the database that match the criteria.
DCOUNT(database,field,criteria)

Database - is the range of cells that makes up the list or database. A database is a list of related data in which rows of related information are records, and columns of data are fields. The first row of the list contains labels for each column.

Field - indicates which column is used in the function. Field can be given as text with the column label enclosed between double quotation marks, such as "USB" or "Speed" or as a number that represents the position of the column within the list: 1 for the first column, 2 for the second column, and so on.

Criteria - is the range of cells that contains the conditions you specify. You can use any range for the criteria argument, as long as it includes at least one column label and at least one cell below the column label for specifying a condition for the column.

Feel free to download the WORD file for better understanding.