Another example is the query planner of a good relational database (PostgreSQL, etc.). Here, SQL can also be viewed as a lazy evaulated programming language, d

Another example is the query planner of a good relational database (PostgreSQL, etc.). Here, SQL can also be viewed as a lazy evaulated programming language, due to its declarative nature and the fact that the execution order is not defined in the code, but instead an (hopefully optimal) execution order is determined by the query planner.