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SIZE
Determines the size of a collection.
Syntax
SIZE ( collection )
Inputs
- collection - A collection of attribute or entity instances. This can be an expression or a relation attribute for instance.
Return type
- integer
Example
Suppose you have a Parent and a Child entity, where Parent has a multivalued relation with Child via the relation Parent.has_Children. With this model the following instances are created:
| Parent instance | Child instance | Child.name | Child.hobbies |
|---|---|---|---|
| Parent_1 | Child_1 | “Kim” | “Reading”, “Dancing” |
| Parent_1 | Child_2 | “Rick” | “Tennis”, “Dancing” |
| Parent_1 | Child_3 | “Bob” | “Painting”, “Basketball”, “Reading” |
| Parent_2 | Child_4 | “Mary” | “Football” |
Then:
| Active instance | Expression | Result | Type |
|---|---|---|---|
| Parent_1 | SIZE ( Parent.has_Children ) | 3 | Integer |
| Parent_2 | SIZE ( Parent.has_Children ) | 1 | Integer |
| none | SIZE ( Parent.has_Children ) | Error | |
| Child_1 | SIZE ( Child.hobbies ) | 2 | Integer |
| Child_3 | SIZE ( Child.hobbies ) | 3 | Integer |
| Child_4 | SIZE ( Child.hobbies ) | 1 | Integer |
| SIZE( ? ) | 0 | Integer |
SIZE and COUNT are similar except for ?:
SIZE ( ? ) results in 0, while COUNT ( ? ) results in ?
Overview
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