Count Function

Calculates the number of records returned by a query.


Count( expr )

The expr placeholder represents a string expression identifying the field that contains the data you want to count or an expression that performs a calculation using the data in the field. Operands in expr can include the name of a table field or function (which can be either intrinsic or user-defined but not other SQL aggregate functions ). You can count any kind of data, including text.


Tip: In Access 2010, the Expression Builder has IntelliSense, so you can see what arguments your expression requires. 

You can use Count to count the number of records in an underlying query. For example, you could use Count to count the number of orders shipped to a particular country.

Although expr can perform a calculation on a field, Count simply tallies the number of records. It does not matter what values are stored in the records.

The Count function does not count records that have Null fields unless expr is the asterisk (*) wildcard character. If you use an asterisk, Count calculates the total number of records, including those that contain Null fields. Count(*) is considerably faster than Count([Column Name]). Do not enclose the asterisk in quotation marks (' '). The following example calculates the number of records in the Orders table:

SELECT Count(*) AS TotalOrders FROM Orders;

If expr identifies multiple fields, the Count function counts a record only if at least one of the fields is not Null. If all of the specified fields are Null, the record is not counted. Separate the field names with an ampersand (&). The following example shows how you can limit the count to records in which either ShippedDate or Freight is not Null:

SELECT Count('ShippedDate & Freight') AS [Not Null] FROM Orders;

You can use Count in a query expression. You can also use this expression in the SQL property of a QueryDef object or when creating a Recordset object based on an SQL query.

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