The following table shows the truth table of the NOT operator.
| Op1 | NOT (Op1) |
|---|---|
| TRUE | FALSE |
| FALSE | TRUE |
| UNKNOWN | UNKNOWN |
Op1 stands for the operand. Note that the negation of UNKNOWN is UNKNOWN.
The table below shows the truth table of the AND and OR operators; Op1 and Op2 are the two operands, and the truth table shows all nine possible combinations.
| Op1 | Op2 | Op1 AND Op2 | Op1 OR Op2 |
|---|---|---|---|
| TRUE | TRUE | TRUE | TRUE |
| TRUE | FALSE | FALSE | TRUE |
| TRUE | UNKNOWN | UNKNOWN | TRUE |
| FALSE | TRUE | FALSE | TRUE |
| FALSE | FALSE | FALSE | FALSE |
| FALSE | UNKNOWN | FALSE | UNKNOWN |
| UNKNOWN | TRUE | UNKNOWN | TRUE |
| UNKNOWN | FALSE | FALSE | UNKNOWN |
| UNKNOWN | UNKNOWN | UNKNOWN | UNKNOWN |
AND and OR operators are symmetric: you can swap Op1 and Op2 without changing the operator outcome.