What will the following statement return: select employee_id last_name from employees where salary select min salary from employees group by department_id )?
What will the following statement return: SELECT employee_id, last_name FROM employees WHERE salary =(SELECT MIN(salary) FROM employees GROUP BY department_id); Nothing. It is an invalid statement. Lees verder »
Will the following statement return one row: select max salary, min salary, avg salary from employees?
Yes, it will return the highest salary, the lowest salary, and the average salary from all employees. Lees verder »
Which statement about the order by clause is true?
We know that option a - You can use a column alias in the ORDER BY clause is true. SQL allows us to use a column alias that we defined in the SELECT statement directly in the ORDER BY clause to sort the results. Lees verder »
What type of joins will return the unmatched values?
Outer joins. Outer joins are joins that return matched values and unmatched values from either or both tables. There are a few types of outer joins: LEFT JOIN returns only unmatched rows from the left table, as well as matched rows in both tables. Lees verder »
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