A.GROUP,HAVING,AVG,DISTINCT B.COUNT,CEIL,MAX,CONCAT C.ORDER,MIN,WHERE,SUM D.NVL,ORDER,SUBSTR,ORDER
A.SELECT * FROM USER WHERE ROWNUM>20 AND ROWNUM<30 B.SELECT * FROM USER WHERE ROWID >20 AND ROWNUM<30 C.SELECT * FROM USER LIMIT 20,30; D.SELECT * FROM USER LIMIT 20,10;
A.原子性 B.隔離性 C.一致性 D.即時性