SQL is not only for queries, it includes a Data Definition Language as part of it I believe. You use SQL to define the schema to which the data in the database must confirm.
Similarly for Prolog and Datalog. You can define the form, the schema of data in a simple way and then the relations between the data by declaring simple inference rules between them.
Datalog has the benefit of being simpler, than Prolog. Simpler is better if that is all we need.
SQL is not only for queries, it includes a Data Definition Language as part of it I believe. You use SQL to define the schema to which the data in the database must confirm.
Similarly for Prolog and Datalog. You can define the form, the schema of data in a simple way and then the relations between the data by declaring simple inference rules between them.
Datalog has the benefit of being simpler, than Prolog. Simpler is better if that is all we need.
This has nothing to do with http :-)