  Database flexible querying is an alternative to the classic one for users.
The use of Formal Concepts Analysis (FCA) makes it possible to make approximate
answers that those turned over by a classic DataBase Management System (DBMS).
Some applications do not need exact answers. However, flexible querying can be
expensive in response time. This time is more significant when the flexible
querying require the calculation of aggregate functions ("Sum", "Avg", "Count",
"Var" etc.). In this paper, we propose an approach which tries to solve this
problem by using Approximate Query Processing (AQP).
