答案:B
A. DBS包括DB和DBMS
B. DBMS包括DB和DBS
C. DB包括DBS和DBMS
D. DBS就是DB,也就是DBMS
A. CREATE PRIVATE SYNONYM
B. CREATE PUBLIC SYNONYM
C. CREATE SYNONYM
D. CREATE ANY SYNONYM
A. DATEPART
B. EXTRACT
C. TO_CHAR
D. TRUNC
A. SYSTEM
B. SYS
C. SCOTT
D. SYSDBA
A. 代理
B. 适配器
C. 应用程序
D. 服务接口
A. SUM (列名)
B. MAX (列名)
C. COUNT ( * )
D. AVG (列名)