Which of the following substitution variables should be used to reuse the variable value without prompting the user each time?

Which of the following SELECT statements will get the result 'elloworld' from the string 'HelloWorld'?

Which of the following views should a user query to display the columns associated with the constraints on a table owned by the user?

What does the TRUNCATE statement do?

Top N analysis requires _____ and _____.

Which data dictionary view holds information about the column in a view?

Which operator will be evaluated first in the statement: select (2+3*4/2-8) from dual:

How many join conditions should be there to avoid a Cartesion Join for joining three tables?

What will happen if you query the emp table shown below: selectempno,DISTINCTename,Salary from emp;

Examine the two SQL statements given below: SELECT last_name, salary, hire_date FROM EMPLOYEES ORDER BY salary DESC; SELECT last_name, salary, hire_date FROM EMPLOYEES ORDER BY 2 DESC; What is true about them?

Examine the code given below: SELECT employee_id FROM employees WHERE commission_pct=.5 OR salary > 23000 Which of the following statement is correct with regard to this code?