RELATE ONE SELECTION

version 6.0 (Modified)

RELATE ONE SELECTION (manyTable; oneTable)

The RELATE ONE SELECTION command creates a new selection of records for the table oneTable, based on the selection of records in the table manyTable.

This command can only be used if there is a relation from manyTable to oneTable. RELATE ONE SELECTION can work across several levels of relations. There can be several related tables between manyTable and oneTable. The relations can be manual or automatic.

The following example finds all the clients whose invoices are due today.

Here is one way of creating a selection in the [Customers] table, given a selection of records in the [Invoices] table:

   CREATE EMPTY SET([Customers];"Payment Due")
   QUERY([Invoices];[Invoices]DueDate = Current date)
   While(Not(End selection([Invoices])))
      RELATE ONE ([Invoices]CustID)
      ADD TO SET([Customers];"Payment Due")
      NEXT RECORD([Invoices])
   End while

The following technique uses RELATE ONE SELECTION to accomplish the same result:

   QUERY([Invoices];[Invoices]DueDate = Current date)
   RELATE ONE SELECTION([Invoices];[Customers])

QUERY, RELATE MANY SELECTION, RELATE ONE, Sets.