你可能感興趣的試題

Examine the structure of the EMPLOYEES table:

You need to create an index called NAME_IDX on the first name and last name fields of the EMPLOYEES table. Which SQL statement would you use to perform this task?（）

A. CREATE INDEX NAME_IDX (first_name, last_name);
B. CREATE INDEX NAME_IDX (first_name AND last_name);
C. CREATE INDEX NAME_IDX   ON (first_name, last_name);
D. CREATE INDEX NAME_IDX   ON employees (first_name AND last_name);
E. CREATE INDEX NAME_IDX   ON employees(first_name, last_name);
F. CREATE INDEX NAME_IDX   FOR employees(first_name, last_name);

單項(xiàng)選擇題

Exhibit:

Examine the data in the EMPLOYEES table.
Examine the subquery:
SELECT last_name
FROM employees
WHERE salary IN (SELECT MAX(salary)
FROM employees
GROUP BY department_id);
Which statement is true?（）

A. The SELECT statement is syntactically accurate.
B. The SELECT statement does not work because there is no HAVING clause.
C. The SELECT statement does not work because the column specified in the GROUP BY clause is not in the SELECT list.
D. The SELECT statement does not work because the GROUP BY clause should be in the main query and not in the subquery.

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Which operator can be used with a multiple-row subquery?（）

你可能感興趣的試題

Examine the structure of the EMPLOYEES table: You need to create an index called NAME_IDX on the first name and last name fields of the EMPLOYEES table. Which SQL statement would you use to perform this task?（）

Exhibit: Examine the data in the EMPLOYEES table. Examine the subquery: SELECT last_name FROM employees WHERE salary IN (SELECT MAX(salary) FROM employees GROUP BY department_id); Which statement is true?（）

Examine the structure of the EMPLOYEES table:

You need to create an index called NAME_IDX on the first name and last name fields of the EMPLOYEES table. Which SQL statement would you use to perform this task?（）

Exhibit:

Examine the data in the EMPLOYEES table.
Examine the subquery:
SELECT last_name
FROM employees
WHERE salary IN (SELECT MAX(salary)
FROM employees
GROUP BY department_id);
Which statement is true?（）