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INTERSECTION
Determines the intersection of two collections. It returns a collection containing the items that are present in both specified collections.
Syntax
INTERSECTION ( collection1 , collection2 )
Inputs
- collection1, collection2 - Collections to be intersected. These collections must be of the same base type.
Return type
- collection
Venn diagram
Examples
Suppose the following model. Entity Teacher has a multivalued relation with entity Child via the relation Teacher.teaches_Children.
| Teacher instance | Child instance | Child.name | Child.hobbies |
|---|---|---|---|
| Teacher_1 | Child_1 | “Kim” | “Reading”, “Dancing” |
| Teacher_1 | Child_2 | “Rick” | “Tennis”, “Dancing” |
| Teacher_1 | Child_3 | “Bob” | “Painting”, “Basketball”, “Reading” |
| Teacher_2 | Child_1 | “Kim” | “Reading”, “Dancing” |
| Teacher_2 | Child_3 | “Bob” | “Painting”, “Basketball”, “Reading” |
| Teacher_2 | Child_4 | “Mary” | “Football” |
| Expression | Result | Type |
|---|---|---|
| INTERSECTION ( Teacher[Teacher_1].teaches_Children , Teacher[Teacher_2].teaches_Children ) | [ Child_1 , Child_3 ] | Collection of Child instances |
| INTERSECTION ( Teacher[Teacher_1].teaches_Children.name , Teacher[Teacher_2].teaches_Children.name ) | [ "Kim" , "Bob" ] | String (multivalued) |
| INTERSECTION ( Child[Child_1].hobbies , Child[Child_3].hobbies ) | [ "Reading" ] | String (multivalued) |
| INTERSECTION ( Child[Child_2].hobbies , Child[Child_3].hobbies ) | [ ] | String (multivalued) |
| INTERSECTION( ?, [ 1, 2 ] ) | UNKNOWN | Integer (multivalued) |
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