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单选题
Management has asked you to calculate the value 12*salary* commission_pct for all the employees in the EMP table. The EMP table contains these columns: LAST NAME VARCNAR2(35) NOT NULL SALARY NUMBER(9,2) NOT NULL COMMISION_PCT NUMBER(4,2) Which statement ensures that a value is displayed in the calculated columns for all employees?（）
A
SELECT last_name, 12*salary* commission_pct FROM emp;
B
SELECT last_name, 12*salary* (commission_pct,0) FROM emp;
C
SELECT last_name, 12*salary*(nvl(commission_pct,0)) FROM emp;
D
SELECT last_name, 12*salary*(decode(commission_pct,0)) FROM emp;
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单选题The EMPLOYEES table has these columns: LAST NAME VARCHAR2(35) SALARY NUMBER(8,2) HIRE_DATE DATE Management wants to add a default value to the SALARY column. You plan to alter the table by using this SQL statement: ALTER TABLE EMPLOYEES MODIFY ( SALARY DEFAULT 5000); What is true about your ALTER statement?（）A
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Column definitions cannot be altered to add DEFAULT values.B
A change to the DEFAULT value affects only subsequent insertions to the table.C
Column definitions cannot be altered to add DEFAULT values for columns with a NUMBER data type.D
All the rows that have a NULL value for the SALARY column will be updated with the value 5000.
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单选题Examine this statement: SELECT student_id, gpa FROM student_grades WHERE gpa value; You run the statement once, and when prompted you enter a value of 2.0. A report is produced. What happens when you run the statement a second time?（）A
An error is returned.B
You are prompted to enter a new value.C
A report is produced that matches the first report produced.D
You are asked whether you want a new value or if you want to run the report based on the previous value.
考题
单选题You are developing the Payroll application that contains the SALARY and COMMISSION forms. When a user invoked the COMMISSION form from the SALARY form, the SAL value should be passed to the COMMISSION form. In which data form and at what time should you define the parameter to accept the value?（）A
SALARY form at runtime. B
SALARY form at design time. C
COMMISSION form at runtime. D
COMMISSION form at design time.
考题
单选题Examine this statement: SELECT student_id, gpa FROM student_grades WHERE gpa value; You run the statement once, and when prompted you enter a value of 2.0. A report is produced. What happens when you run the statement a second time?（）A
An error is returned.B
You are prompted to enter a new value.C
A report is produced that matches the first report produced.D
You are asked whether you want a new value or if you want to run the report based on the previous value.
考题
单选题Management has asked you to calculate the value 12*salary* commission_pct for all the employees in the EMP table. The EMP table contains these columns: LAST NAME VARCNAR2(35) NOT NULL SALARY NUMBER(9,2) NOT NULL COMMISION_PCT NUMBER(4,2) Which statement ensures that a value is displayed in the calculated columns for all employees? （）A
SELECT last_name, 12*salary* commission_pct FROM emp;B
SELECT last_name, 12*salary* (commission_pct,0) FROM emp;C
SELECT last_name, 12*salary*(nvl(commission_pct,0)) FROM emp;D
SELECT last_name, 12*salary*(decode(commission_pct,0)) FROM emp;
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