A.刪除掉 ‘產(chǎn)品數(shù)據(jù)庫’
B.把‘產(chǎn)品數(shù)據(jù)庫’改名為’product’
C.刪除掉‘product’
D.把’product’改名為‘產(chǎn)品數(shù)據(jù)庫

A. SELECT * FROM CUSTOMERS WHERE AGE=20
B. DROP FROM CUSTOMERS WHERE AGE=20
C. SELECT FROM CUSTOMERS WHERE AGE=20
D. DELETE  FROM CUSTOMERS WHERE CUSTID=5