関連ワード:  ddl in dbms with example    ddl commands in dbms with examples    define ddl in dbms with example    ddl commands in dbms with examples pdf    ddl dml dcl in dbms with example    ddl commands in mysql with examples    ddl and dml commands in dbms with example    ddl and dml constructs in dbms with examples    ddl command in dbms    what is ddl in dbms