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Learn more about the logical functions AND, OR, NOT, logical values TRUE, FALSE, and the special meta-value UNKNOWN.
Overview
Function / value | Description |
---|---|
AND | Returns TRUE if all its arguments evaluate to TRUE; it returns FALSE if one or more arguments evaluate to FALSE. |
NOT | Reverses the value of its boolean argument. |
OR | Returns TRUE if at least one of its arguments evaluates to TRUE; it returns FALSE if none of the arguments evaluate to TRUE. |
UNKNOWN | Use the '?' (question mark), representing UNKNOWN, to check if an expression or an attribute has a value. |
TRUE | This is the boolean value TRUE. |
FALSE | This is the boolean value FALSE. |
Functions
AND
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
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 ...]
Input
- 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 |
NOT
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
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 |
TRUE
This is the boolean value TRUE.
FALSE
This is the boolean value FALSE.
4 Comments
Unknown User (d.van.der.poel)
I was wondering in what order logical operators are processed. My assumption was AND first, then OR. It seems that it is neither that nor the other way around:
FALSE AND FALSE OR TRUE --> TRUE (consistent with AND first, inconsistent with OR first)
TRUE OR FALSE AND FALSE --> FALSE (consistent with OR first, inconsistent with AND first)
Both: consistent with ( ( A operator B ) operator C )
Edit: corrected a copy-paste error
Menno Gülpers
I always learned to use brackets. When omitted, expect anything, even the spanish inquisition.
Rory Tans
In older documentation I saw a comment that there was a operator for exclusive or (Logical functions).
Is there a build in operator or do i still model this like ?
Louis Wouters
You can use ' != ' (does not equal) to perform XOR on two boolean expressions.
Note the difference between using ' != ' as ...
Manual input of ?
Manual input of ?