Count()

Category: Aggregate

Syntax: Count ( field {; field...} )

Parameters:

fieldAny related field, repeating field, or set of non-repeating fields; or an expression that returns a field, repeating field, or set of non-repeating fields. Parameters in curly braces { } are optional and may be repeated as needed, separated by a semicolon.

Data type returned: Number

Description:

Returns a count of the fields (or repetitions, in the case of repeating fields) in the parameter list that contain non-blank values.

When the parameter list consists of two or more repeating fields, Count() returns a repeating field in which the corresponding repetitions from the specified fields are counted separately. So if a field Repeater1 has three values, 16, 20, and 24, and another field, Repeater2, has two values, 14 and 25, Count (Repeater1; Repeater2) would return a repeating field with values 2, 2, and 1.

Examples:

Function

Results

Count ( field1; field2; field3 )

Returns 2 when field1 and field2 contain valid values, and field3 is empty.

Count ( repeatingField )

Returns 2 when repetitions 1 and 2 contain valid values, and repetition 3 is empty.

Count ( InvoiceItem::InvoiceID )

Returns 2 when the current record is related to two InvoiceItem records. When using the Count() function to count the number of related records, be sure to count a field that is guaranteed not to be blank, such as the table's primary key.

FileMaker 8 modifies the Count() function to take portal and field context into account. For example, in a scenario where a Customer table occurrence is related one-to-many with an Invoice table occurrence that is then related one-to-many to a LineItem table occurrence, evaluating a Count() function from Customer to LineItem will yield all LineItem records for the current Customer record if the user's context is on the Customer TO; but if the user's context is on the Invoice TO (if a user clicks in an Invoice portal row, say, or a script navigates into the portal using a Go To Field script step), Count(LineItem::field) will return a count of just those line items related to the currently selected invoice. Given that calculation fields explicitly specify their evaluation context, this issue is most likely to arise in scripting.






FileMaker 8 Functions and Scripts Desk Reference
FileMaker 8 Functions and Scripts Desk Reference
ISBN: 0789735113
EAN: 2147483647
Year: 2004
Pages: 352
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