A. NUMBER B. CHAR C. VARCHAR2 DATE
A. SELECTdeptno,sum(sal)FROMemp; B. SELECTdeptno,sum(sal)FROMempWHEREavg(sal)>2000GROUPBYdeptno; C. SELECTdeptno,sum(sal)FROMempGROUPBYdeptnoHAVINGavg(sal)>2000; D. SELECTdeptno,sum(sal)FROMempWHEREavg(sal)>2000ORDERBYdeptno;
A. DESC B. PPEND C. DISC DEFINE
A. DBWR B. LGWR C. SMON D. PMON
A. 预警文件 B. 服务器进程跟踪文件 C. 控制文件 D. 后台进程跟踪文件