86.Examine the structure and data of the CUST_TRANS table:

86.Examine the structure and data of the CUST_TRANS table:

CUST_TRANS

Name Null Type

CUSTNO NOT NULL CHAR(2)

TRANSDATE DATE

TRANSAMT NUMBER(6,2)

CUSTNO TRANSDATE TRANSAMT

11 01-JAN-07 1000

22 01-FEB-07 2000

33 01-MAR-07 3000

Dates are stored in the default date format dd-mon-rr in the CUST_TRANS table.

Which SQL statements would execute successfully? (Choose three .)

A.SELECT transdate + '10' FROM cust_trans;

B.SELECT * FROM cust_trans WHERE transdate = '01-01-07';

C.SELECT transamt FROM cust_trans WHERE custno > '11';

D.SELECT * FROM cust_trans WHERE transdate='01-JANUARY-07';

E.SELECT custno + 'A' FROM cust_trans WHERE transamt > 2000;

答案:ACD

解析：

A.正确，varchar可以隐式转成数字

B.错误，参考85

C.正确，和A一样

D.正确，参考85

E.错误，两个字符不能使用+运算符