User manual

Table Of Contents
106 FileMaker Pro User’s Guide
3.
In the Specify Calculation dialog box, define a calculation that determines which portal records will be displayed.
For example, if you are working in an Invoices layout, in a portal that shows product records from a
LineItems table, and want to display just the products with quantities greater than 1, use the formula
If(LineItems::Quantity < 1; 0; 1).
4. Click OK.
Important The results of summary fields, calculations, and find requests are based on the full set of related
records, not just the records in a portal that are filtered. For example, if a portal is displaying a filtered subset
of records, and a Total of summary field outside the portal summarizes these records, the summary field will
total all related records, not just the displayed records.
For more information about filtering records in portals, see Help.
About lookups
A lookup copies data from another table into a field in the current table. After data is copied, it becomes part
of the current table (and remains in the table from which it was copied). Data copied to the current table does
not change automatically when the data in the other table changes, unless the data in the match field of the
current table changes.
To establish a connection between tables for a lookup, you create a relationship. Then you define a lookup
to copy data from a field in the related table into a field in the current table.
When you type a value in the match field of the current table, FileMaker Pro uses the relationship to access
the first record in the related table whose match field contains a matching value. Next, it copies the value
from the lookup source field into the lookup target field, where the value is stored.
After a value is copied into the lookup target field, you can edit, replace, or delete it like any other value
(because the lookup value belongs to the current table). You can also update data in the current table to
match data that changes in the related table.
Creating lookups
To create a lookup:
1. Create a relationship for the lookup between the match field of the current table and the match field of
the related table. See
“Creating relationships” on page 103.
2. With the database open, choose File menu > Manage > Database.
3. In the Manage Database dialog box, click the Fields tab.
C235Client ID
Name
42.83.91.04Phone
ParisCity
C100Client ID
Name
555-3849Phone
VancouverCity
Current table
C200Client ID
SmithName
Records in related table
Relationship
Lookup target field Lookup source field
C200Client ID
SmithName
555-1234Phone
New YorkCity