The following describes how to define a set of field values using a nested set definition.
In such cases, the element functions P() and E() must be used, representing the element set of possible values and the excluded values of a field, respectively. Inside the parentheses, it is possible to specify one set expression and one field, for example P({1} Customer). These functions cannot be used in other expressions.
Examples and results:
| Examples | Results |
|---|---|
| sum( {$<Customer = P({1<Product={‘Shoe’}>} Customer)>} Sales ) |
Returns the sales for current selection, but only those customers that ever have bought the product ‘Shoe’. The element function P( ) here returns a list of possible customers; those that are implied by the selection ‘Shoe’ in the field Product. |
| sum( {$<Customer = P({1<Product={‘Shoe’}>})>} Sales ) |
Same as above. If the field in the element function is omitted, the function will return the possible values of the field specified in the outer assignment. |
| sum( {$<Customer = P({1<Product={‘Shoe’}>} Supplier)>} Sales ) |
Returns the sales for current selection, but only those customers that ever have supplied the product ‘Shoe’. The element function P( ) here returns a list of possible suppliers; those that are implied by the selection ‘Shoe’ in the field Product. The list of suppliers is then used as a selection in the field Customer. |
| sum( {$<Customer = E({1<Product={‘Shoe’}>})>} Sales ) |
Returns the sales for current selection, but only those customers that never bought the product ‘Shoe’. The element function E( ) here returns the list of excluded customers; those that are excluded by the selection ‘Shoe’ in the field Product. |
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