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AND
This function returns TRUE if all its arguments evaluate to TRUE; it returns FALSE if one or more arguments evaluate to FALSE.
Syntax
argument1 AND argument2 [AND ...]
- argument1 - The first boolean condition that you want to evaluate.
- argument2 - The first boolean condition that you want to evaluate.
- [AND …] - Additional boolean conditions that you want to evaluate. (optional)
Return type
- boolean
Examples
Expression | Result | Type |
---|---|---|
TRUE AND TRUE | TRUE | Boolean |
TRUE AND FALSE | FALSE | Boolean |
TRUE AND ? (= UNKNOWN) | UNKNOWN | Boolean |
OR
This function returns TRUE if at least one of its arguments evaluates to TRUE; it returns FALSE if none of the arguments evaluate to TRUE.
Syntax
argument1 OR argument2 [OR ...]
argument1 - The first boolean condition that you want to evaluate. argument2 - The first boolean condition that you want to evaluate. [OR …] - Additional boolean conditions that you want to evaluate.
Return type
- boolean
Examples
Expression | Result | Type |
---|---|---|
TRUE OR TRUE | TRUE | Boolean |
TRUE OR FALSE | TRUE | Boolean |
FALSE OR FALSE | FALSE | Boolean |
TRUE OR ? (= UNKNOWN) | TRUE | Boolean |
FALSE OR ? (= UNKNOWN) | UNKNOWN | Boolean |
TRUE
This is the boolean value TRUE.
FALSE
This is the boolean value FALSE.
NOT
This operator reverses the value of its boolean argument.
Syntax
NOT argument
- argument - The boolean condition of which you want to reverse its value.
Return type
- boolean
Examples
Expression | Result | Type |
---|---|---|
NOT (TRUE) | FALSE | Boolean |
NOT (TRUE AND FALSE) | TRUE | Boolean |
NOT ( ? (= UNKNOWN) ) | UNKNOWN | Boolean |
NOT (NOT (TRUE)) | TRUE | Boolean |
UNKNOWN
You can use the '?' (question mark), representing UNKNOWN, to check if an expression or an attribute has a value.
Example
Suppose a model with an entity Person and attributes Person.name and Person.age. In runtime, a user fills out a form and enters his name, but forgets to fill out his age.
As a result:
Expression | Result | Type | Reason |
---|---|---|---|
Person.name = ? | FALSE | Boolean | This attribute is filled out |
Person.age = ? | TRUE | Boolean | This attribute is not filled out, and therefore UNKNOWN |