They are used to compare two values. Their functions are shown in the table below
| Operator | Relation tested | Example |
| = | Equality | X = Y |
| < > | Inequality | X<> Y |
| < | Less than | X < Y |
| > | Greater than | X > Y |
| < = | Less than or equal to | X< = Y |
| > = | Greater than or equation | X > = Y |
The hierarchy of the relational operation is =, >, <, <>, < = and >=