單項選擇題

Which syntax turns an existing constraint on?（）

A. ALTER TABLE table_name ENABLE constraint_name;
B. ALTER TABLE table_name STATUS = ENABLE CONSTRAINT constraint _ name;
C. ALTER TABLE table_name ENABLE CONSTRAINT constraint _ name;
D. ALTER TABLE table_name TURN ON CONSTRAINT constraint _ name;

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單項選擇題

Management has asked you to calculate the value 12salary commission_pct for all the employees in the EMP table. The EMP table contains these columns:

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;

單項選擇題

Examine the description of the EMPLOYEES table:

Which statement shows the maximum salary paid in each job category of each department?（）

A. SELECT dept_id, job_cat, MAX(salary)   FROM employees   WHERE salary > MAX(salary);
B. SELECT dept_id, job_cat, MAX(salary)   FROM employees   GROUP BY dept_id, job_cat;
C. SELECT dept_id, job_cat, MAX(salary)   FROM employees;
D. SELECT dept_id, job_cat, MAX(salary)   FROM employees   GROUP BY dept_id;
E. SELECT dept_id, job_cat, MAX(salary)   FROM employees   GROUP BY dept_id, job_cat, salary;

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Which syntax turns an existing constraint on?（）

你可能感興趣的試題

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: Which statement ensures that a value is displayed in the calculated columns for all employees?（）

Examine the description of the EMPLOYEES table: Which statement shows the maximum salary paid in each job category of each department?（）

Management has asked you to calculate the value 12salary commission_pct for all the employees in the EMP table. The EMP table contains these columns:

Which statement ensures that a value is displayed in the calculated columns for all employees?（）

Examine the description of the EMPLOYEES table:

Which statement shows the maximum salary paid in each job category of each department?（）