関連ワード:  what is data model in dbms    what is data model in dbms and what are its types    what is data model in dbms with example    what is data model in dbms in simple words    what is data model in dbms in hindi    what is database model in dbms    what is relational data model in dbms    what is conceptual data model in dbms    what is network data model in dbms    what is physical data model in dbms