OCP-1Z0-051-V9.02-25题

25. You need to create a table with the following column specifications:

1. Employee ID (numeric data type) for each employee

2. Employee Name (character data type) that stores the employee name

3. Hire date, which stores the date of joining the organization for each employee

4. Status (character data type), that contains the value 'ACTIVE' if no data is entered

5. Resume (character large object [CLOB] data type), which contains the resume submitted by the

employee

Which is the correct syntax to create this table?

A. CREATE TABLE EMP_1        

(emp_id NUMBER(4), 

emp_name VARCHAR2(25), 

start_date DATE, 

e_status VARCHAR2(10) DEFAULT 'ACTIVE', 

resume CLOB(200));

B. CREATE TABLE 1_EMP        

(emp_id NUMBER(4), 

emp_name VARCHAR2(25), 

start_date DATE, 

emp_status VARCHAR2(10) DEFAULT 'ACTIVE', 

resume CLOB);

C. CREATE TABLE EMP_1  

(emp_id NUMBER(4), 

emp_name VARCHAR2(25), 

start_date DATE, 

emp_status VARCHAR2(10) DEFAULT "ACTIVE", 

resume CLOB);

D. CREATE TABLE EMP_1        

(emp_id  NUMBER, 

emp_name VARCHAR2(25), 

start_date DATE, 

emp_status VARCHAR2(10) DEFAULT 'ACTIVE', 

resume CLOB);

Answer: D

答案解析：

A答案：CLOB不需要跟size。

sh@TEST0924> CREATE TABLE EMP_1

  2  (resume CLOB(200));

(resume CLOB(200))

            *

ERROR at line 2:

ORA-00907: missing right parenthesis

 

 

sh@TEST0924> CREATE TABLE EMP_1

  2  (resume CLOB);

 

Table created.

B答案：表名不以数字开头，或者加上双引号，或者只能以字母开头

sh@TEST0924> CREATE TABLE 1_EMP

  2  (emp_id NUMBER(4));

CREATE TABLE 1_EMP

             *

ERROR at line 1:

ORA-00903: invalid table name

 

 

sh@TEST0924> CREATE TABLE "1_EMP"

  2  (emp_id NUMBER(4));

 

Table created.

C答案：字符默认值不能用双引号，需要使用单引号。

sh@TEST0924> CREATE TABLE EMP_2

  2  (emp_status VARCHAR2(10) DEFAULT "ACTIVE");

(emp_status VARCHAR2(10) DEFAULT "ACTIVE")

                                 *

ERROR at line 2:

ORA-00984: column not allowed here

 

 

sh@TEST0924> CREATE TABLE EMP_2

  2  (emp_status VARCHAR2(10) DEFAULT 'ACTIVE');

 

Table created.

 

D答案：D正确，可成功创建表。

 

sh@TEST0924> CREATE TABLE EMP_3

  2  (emp_id  NUMBER,

  3  emp_name VARCHAR2(25),

  4  start_date DATE,

  5  emp_status VARCHAR2(10) DEFAULT 'ACTIVE',

  6  resume CLOB);

 

 

Table created.