The paper approach the implementation of the Structured Query Language (SQL) database technology in the strategies for forward or backward reasoning in the rule based Expert Systems (ES). The SQL technology, which is well known from the Database Environments, was recently applied in the new powerful object oriented software tools. Thus, the SQL technology becomes very attractive for the developers of the ES. After a short description of the main inference mechanism strategies linked with the SQL approach, a solution for implementing a SQL inference mechanism is given in the paper. This solution is discussed for each type of forward and backward chaining. A case study for an implemented forward chaining mechanism as a part of an ES elaborated by the authors is discussed. Finally, certain conclusions are presented.
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