Didactics of Multi-Tables Select Sentence in SQL Based on the Navigation of Database Scheme
Shenghong Li · Computer education · 2009
The didactics of select sentence in SQL is a keystone.A new didactics is proposed for the didactics based on the relationships,navigation,among the tables of a database scheme according to the principle of natural joint in relationship algebra.The mapping between a problem and a select sentence can be constructed by means of the navigation between tables,where a solution can be solved from a given condition.The effect of the didactics is remarkable.