We will not cover this section, aside from making a few remarks about this language. Quel was the original query language for the Ingres dbms. Quel closely resembles the tuple relational calculus.
Queries use the range of, retrieve and where clauses.
There is no representation for or in Quel. Quel has the power of the relational algebra by means of the any aggregate function and the use of insertion and deletion into temporary relations.