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UNIQUEThe Syntax
Input
Return type
Examples Suppose the following model.
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collection1 SUBSET OF collection2 |
- collection1 - The collection that is tested to be a subset of the second collection.
- collection2 - The collection that is tested to hold all the items in the first collection.
Return type
- Boolean
Venn diagram
Examples
Given Person.hobbies = [ "Tennis" , "Soccer" ]
Given Person.hobbies = [ ? ]
Given Person.hobbies = [ "Tennis" , "Soccer" ]
Person.hobbies SUBSET OF [ ? ] = FALSE
1 SUBSET OF Address.Numbers
Given Adress.Numbers = ?
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Values between single quotes are considered value list items. For backwards compatibility reasons, a comma separated sequence of value list items is treated as a collection. That's why there is no need to enclose the values between square brackets. In fact if you do add the square brackets you create a matrix rather than a list. |
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UNION
Adds two collections of the same base type to a new collection.
Syntax
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UNION ( collection1 , collection2 ) |
- collection1 - First collection to be added to the new collection.
- collection2 - Second collection to be added to the new collection.
Return type
- collection
Venn diagram
Examples
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[Parent_2].Has_Children )
Parent[Parent_2].Has_Children.name )
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INTERSECTION
This function determines the intersection of two collections. It returns a collection containing the items that are present in both specified collections.
Syntax
Code Block |
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INTERSECTION ( collection1 , collection2 ) |
- 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
.
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DIFFERENCE
This function returns a collection containing all the items from collection1 that are not present in collection2.
Syntax
Code Block |
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DIFFERENCE ( collection1 , collection2 ) |
...
- collection1, collection2 - Collections to be compared. These collections must be of the same base type.
Return type
- collection
Venn diagram
Examples
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SYMMETRIC_DIFFERENCE
This function determines the symmetric difference between two collections. It returns a collection with the elements of the provided collections which are in either one of the collections, but not in both.
Syntax
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SYMMETRIC_DIFFERENCE ( collection1 , collection2 ) |
...
- collection1, collection2 - Collections to be compared. These collections must be of the same base type.
Return type
- collection
Venn diagram
Examples
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A note on collections and duplicates
An expression resulting in a collection does not contain duplicates. Please be aware however, that intermediary results of a COLLECT
statement can contain duplicates. You have to be aware of this when using the SIZE
or UNPACK
function, or when using TSL.
This is best illustrated with the following examples.
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TSL:
The ages present are: [[[ COLLECT Person.Age FROM ALL Person ]]].
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Now an example with the UNPACK function. We leave out the first instance from the previous example.
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Only the intermediary results of a |
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