OCP-1Z0-051-V9.02-159题

159. View the Exhibit and examine the structure of the CUSTOMERS table.

NEW_CUSTOMERS is a new table with the columns CUST_ID, CUST_NAME and CUST_CITY that

have the same data types and size as the corresponding columns in the CUSTOMERS table.

Evaluate the following INSERT statement:

INSERT INTO new_customers (cust_id, cust_name, cust_city)

VALUES(SELECT cust_id,cust_first_name' 'cust_last_name,cust_city    去掉

FROM customers   

WHERE cust_id > 23004);

The INSERT statement fails when executed. What could be the reason?

A. The VALUES clause cannot be used in an INSERT with a subquery. values后面不能跟子查询，或者直接不要VALUES

B. Column names in the NEW_CUSTOMERS and CUSTOMERS tables do not match.

C. The WHERE clause cannot be used in a subquery embedded in an INSERT statement.

D. The total number of columns in the NEW_CUSTOMERS table does not match the total number of

columns in the CUSTOMERS table.

Answer: A

答案解析：

即insert into后面的如果有子句，则不用values

sh@TESTDB> create table new_sustomers as select cust_id,cust_last_name,cust_city

  2  from customers where 1=0;

Table created.

sh@TESTDB> insert into new_sustomers(CUST_ID, CUST_LAST_NAME,CUST_CITY)

  2  values

  3  (select cust_id,cust_first_name||cust_last_name,cust_city  from customers where cust_id>23004)

  4  ;

(select cust_id,cust_first_name||cust_last_name,cust_city  from customers where cust_id>23004)

*

ERROR at line 3:

ORA-00936: missing expression

去掉values后正常

sh@TESTDB> insert into new_sustomers(CUST_ID, CUST_LAST_NAME,CUST_CITY)

  2  (select cust_id,cust_first_name||cust_last_name,cust_city  from customers where cust_id>23004)

  3  ;

32496 rows created.