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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 |
| FALSE AND ? | FALSE | 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 |
Using brackets is not required, but advised to clearly indicate which boolean condition needs to be reversed.
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 |
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