A.It is owned by the SYSTEM user

B.Data dictionary views are created by joins of dictionary base tables and DBA-defined tables

C.Base tables can be queried directly

D.The data dictionary is created and maintained by the database administrator

E.Usernames of all users including database administrators are stored in the data dictionary

F.Views with the same name but different prefixes, such as CDB, DBA, ALL and USER, reference the same base tables from the data dictionary

A.A segment might have only one extent

B.The extents of a segment must always reside in the same datafile

C.A smallfile tablespace might be bigger than a bigfile tablespace

D.A segment's blocks can be of different sizes

E.Segments can span multiple tablespaces

F.All tablespaces may have one or more data files

G.A segment can span multiple data files in some tablespaces

A.SELECT TO_DATE(SYSDATE, `DD/MONTH/YYYY') ?`01/JANUARY/2019' FROM DUAL;

B.SELECT SYSDATE ?TO_DATE('01-JANUARY-2019') FROM DUAL;

C.SELECT TO_CHAR(SYSDATE, `DD-MON-YYYY') ?'01-JAN-2019' FROM DUAL;

D.SELECT ROUND(SYSDATE ?'01-JAN-2019') FROM DUAL;

E.SELECT ROUND(SYSDATE ?TO_DATE(`01/JANUARY/2019')) FROM DUAL;

A.Employee 100 will have SALARY set to the same value as the SALARY of employee 200

B.Employee 100 will have JOB_ID set to the same value as the JOB_ID of employee 200

C.Employees 100 and 200 will have the same SALARY as before the update command

D.Employee 200 will have SALARY set to the same value as the SALARY of employee 100

E.Employees 100 and 200 will have the same JOB_ID as before the update command

F.Employee 200 will have JOB_ID set to the same value as the JOB_ID of employee 100

A.It is available only when the database is open

B.It can be used to perform database recovery

C.The same port number can be used for Database Express configurations for databases on different hosts

D.It can be used to switch a database into ARCHIVELOGMODE

E.The same port number can be used for multiple Database Express configurations for multiple databases on the same host