1.   As we shall see, the relational calculus is less procedural, and the database system is expected to translate this into the procedural steps of the relational algebra.

2.   We now look at the relational algebra and the relational calculus in more detail.

3.   When compared to the relational algebra, the relational calculus is more oriented towards expressing the user requests in a way that the user may construct.

4.   The QUEL data manipulation language of Ingres is a well used DML which is based on the relational calculus.