関連ワード:  database management system code 402    database management system class 10 code 402 questions and answers    database management system class 10 code 402 notes    database management system class 10 code 402    database management system class 10 code 402 pdf    database management system class 10 questions and answers code 402 mcq    what is database management system pdf    dbms codes    what is database management system    what do you mean database management system