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【单项选择题】

The EMPLOYEES table has these columns:<br /> LAST NAME VARCHAR2(35)<br /> SALARY NUMBER(8,2)<br /> HIRE_DATE DATE<br /> Management wants to add a default value to the SALARY column. You plan to alter the table by using this SQL statement:<br /> ALTER TABLE EMPLOYEES<br /> MODIFY ( SALARY DEFAULT 5000);<br /> What is true about your ALTER statement?（）<p> The EMPLOYEES table has these columns:<br /> LAST NAME VARCHAR2(35)<br /> SALARY NUMBER(8,2)<br /> HIRE_DATE DATE<br /> Management wants to add a default value to the SALARY column. You plan to alter the table by using this SQL statement:<br /> ALTER TABLE EMPLOYEES<br /> MODIFY ( SALARY DEFAULT 5000);<br /> What is true about your ALTER statement?（）</p>

A、A. Column definitions cannot be altered to add DEFAULT values.

B、B. A change to the DEFAULT value affects only subsequent insertions to the table.

C、C. Column definitions cannot be altered at add DEFAULT values for columns with a NUMBER data type.

D、D. All the rows that have a NULL value for the SALARY column will be updated with the value 5000.

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更多“The EMPLOYEES table has these columns:<br /> LAST NAME VARCHAR2(35)<br /> SALARY NUMBER(8,2)<br /> HIRE_DATE DATE<br /> Management wants to add a default value to the SALARY column. You plan to alter the table by using this SQL statement:<br /> ALTER TABLE EMPLOYEES<br /> MODIFY ( SALARY DEFAULT 5000);<br /> What is true about your ALTER statement?（）<p> The EMPLOYEES table has these columns:<br /> LAST NAME VARCHAR2(35)<br /> SALARY NUMBER(8,2)<br /> HIRE_DATE DATE<br /> Management wants to add a default value to the SALARY column. You plan to alter the table by using this SQL statement:<br /> ALTER TABLE EMPLOYEES<br /> MODIFY ( SALARY DEFAULT 5000);<br /> What is true about your ALTER statement?（）</p>”相关的问题
第1题
[单选题] Examine the data in the EMPLOYEES and DEPARTMENTS tables: Also examine the SQL statements that create the EMPLOYEES and DEPARTMENTS tables: On the EMPLOYEES table, EMPLOYEE_ID is the primary key. MGR_ID is the ID of managers and refers to the EMPLOYEE_ID. DEPT_ID is foreign key to DEPARTMENT_ID column of the DEPARTMENTS table. On the DEPARTMENTS table, DEPARTMENT_ID is the primary key. Examine this DELETE statement: What happens when you execute the DELETE statement?（）

A、Only the row with department ID 40 is deleted in the DEPARTMENTS table.  B、The statement fails because there are child records in the EMPLOYEES table with department ID 40.  C、The row with department ID 40 is deleted in the DEPARTMENTS table. Also the rows with employee IDs 110 and 106 are deleted from the EMPLOYEES table.  D、The row with department ID 40 is deleted in the DEPARTMENTS table. Also the rows with employee IDs 106 and 110 and the employees working under employee 110 are deleted from the EMPLOYEES table.  E、The row with department ID 40 is deleted in the DEPARTMENTS table. Also all the rows in the EMPLOYEES table are deleted.  F、The statement fails because there are no columns specifies in the DELETE clause of the DELETE statement.  

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第2题
[单选题] You executed the following SQL statement to shrink the EMPLOYEES table segment stored in the EXAMPLE tablespace: ALTER TABLE employees SHRINK SPACE CASCADE; Which statement is correct in this scenario?（）

A、The EMPLOYEES table will be changed to read-only mode during the shrink operation.  B、The indexes created on the EMPLOYEES table will need to be rebuilt after the shrink operation is over.  C、The shrink behavior will be cascaded to all dependent segments of the table that support a shrink operation.  D、Data manipulation language (DML) operations will not be possible on the EMPLOYEES table during the COMPACTION phase of the shrink operation.  

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第3题
[] Examine the structure of the EMP_DEPT_VU view: Column Name Type Remarks EMPLOYEE_ID NUMBER From the EMPLOYEES table EMP_NAME VARCHAR2(30) From the EMPLOYEES table JOB_ID VARCHAR2(20) From the EMPLOYEES table SALARY NUMBER From the EMPLOYEES table DEPARTMENT_ID NUMBER From the DEPARTMENTS table DEPT_NAME VARCHAR2(30) From the DEPARTMENTS table Which SQL statement produces an error?（） Examine the structure of the EMP_DEPT_VU view: Column Name Type Remarks EMPLOYEE_ID NUMBER From the EMPLOYEES table EMP_NAME VARCHAR2(30) From the EMPLOYEES table JOB_ID VARCHAR2(20) From the EMPLOYEES table SALARY NUMBER From the EMPLOYEES table DEPARTMENT_ID NUMBER From the DEPARTMENTS table DEPT_NAME VARCHAR2(30) From the DEPARTMENTS table Which SQL statement produces an error?（）

A、A. SELECT * FROM emp_dept_vu;  B、B. SELECT department_id, SUM(salary) FROM emp_dept_vu GROUP BY department _ id;  C、C. SELECT department_id, job_id, AVG(salary) FROM emp_dept_vu GROUP BY department _ id, job_id;  D、D. SELECT job_id, SUM(salary) FROM emp_dept_vu WHERE department_id IN (10,20) GROUP BY job_id HAVING SUM (salary) > 20000  E、E. None of the statements produce an error; all are valid.  

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第4题
[] Observe the structure of the table employees: The table contains 8475 records. One of the employees wants to know the names of all employees of the company. For this, he fires the following query: SELECT * FROM EMPLOYEES ORDER BY emp_fname; Since the operation performed on executing the query cannot fit into memory, it requires disk space to complete the operation. Which of the following types of segments will Oracle allocate to complete the operation and to provide the required result?（） Observe the structure of the table employees: The table contains 8475 records. One of the employees wants to know the names of all employees of the company. For this, he fires the following query: SELECT * FROM EMPLOYEES ORDER BY emp_fname; Since the operation performed on executing t

A、A. Rollback segment  B、B. Temporary segment  C、C. Data segment  D、D. Index segment  

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第5题
[单选题] Examine the data in the EMPLOYEES and DEPARTMENTS tables: EMPLOYEES EMP_NAME DEPT_ID MGR_ID JOB_ID SALARY EMPLOYEE_ID 101 Smith 20 120 SA_REP 4000 102 Martin 10 105 CLERK 2500 103 Chris 20 120 IT_ADMIN 4200 104 John 30 108 HR_CLERK 2500 105 Diana 30 108 IT_ADMIN 5000 106 Smith 40 110 AD_ASST 3000 108 Jennifer 30 110 HR_DIR 6500 110 Bob 40 EX_DIR 8000 120 Ravi 20 110 SA*DIR 6500 DEPARTMENTS DEPARTMENT_ID DEPARTMENT_NAME 10 Admin 20 Education 30 IT 40 Human Resources Also examine the SQL statements that create the EMPLOYEES and DEPARTMENTS tables: CREATE TABLE departments (department_id NUMBER PRIMARY KEY, department _ name VARCHAR2(30)); CREATE TABLE employees (EMPLOYEE_ID NUMBER PRIMARY KEY, EMP_NAME VARCHAR2(20), DEPT_ID NUMBER REFERENCES departments(department_id), MGR_ID NUMBER REFERENCES employees(employee id)

A、Only the row with department ID 40 is deleted in the DEPARTMENTS table.  B、The statement fails because there are child records in the EMPLOYEES table with department ID 40.  C、The row with department ID 40 is deleted in the DEPARTMENTS table. Also the rows with employee IDs 110 and 106 are deleted from the EMPLOYEES table.  D、The row with department ID 40 is deleted in the DEPARTMENTS table. Also the rows with employee IDs 106 and 110 and the employees working under employee 110 are deleted from the EMPLOYEES table.  E、The row with department ID 40 is deleted in the DEPARTMENTS table. Also all the rows in the EMPLOYEES table are deleted.  F、The statement fails because there are no columns specifies in the DELETE clause of the DELETE statement.  

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第6题
[单选题] You added a PHONE_NUMBER column of NUMBER data type to an existing EMPLOYEES table. The EMPLOYEES table already contains records of 100 employees. Now, you want to enter the phone numbers of each of the 100 employees into the table. Some of the employees may not have a phone number available. Which data manipulation operation do you perform?（）

A、MERGE  B、INSERT  C、UPDATE  D、ADD  E、ENTER  F、You cannot enter the phone numbers for the existing employee records.  

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第7题
[单选题] You added a PHONE_NUMBER column of NUMBER data type to an existing EMPLOYEES table. The EMPLOYEES table already contains records of 100 employees. Now, you want to enter the phone numbers of each of the 100 employees into the table. Some of the employees may not have a phone number available. Which data manipulation operation do you perform?（）

A、MERGE  B、INSERT  C、UPDATE  D、ADD  E、ENTER  F、You cannot enter the phone numbers for the existing employee records.  

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第8题
[单选题] You added a PHONE_NUMBER column of NUMBER data type to an existing EMPLOYEES table. The EMPLOYEES table already contains records of 100 employees. Now, you want to enter the phone numbers of each of the 100 employees into the table. Some of the employees may not have a phone number available. Which data manipulation operation do you perform? （）

A、MERGE  B、INSERT  C、UPDATE  D、ADD  E、ENTER  F、You cannot enter the phone numbers for the existing employee records.  

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第9题
[单选题] Examine the statement:Create synonym emp for hr. employees;What happens when you issue the statement?（）

A、An error is generated.  B、You will have two identical tables in the HR schema with different names.  C、You create a table called employees in the HR schema based on you EMP table.  D、You create an alternative name for the employees table in the HR schema in your own schema.  

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第10题
[单选题] Examine the statement: Create synonym emp for hr. employees; What happens when you issue the statement? （）

A、An error is generated.  B、You will have two identical tables in the HR schema with different names.  C、You create a table called employees in the HR schema based on you EMP table.  D、You create an alternative name for the employees table in the HR schema in your own schema.  

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