Which of the following statements are true if Adam wants to modify the structure of the Students table so that the data type of the Stud_Phone column changes from VARCHAR2 to NUMBER?
Which of the following SQL statements would correctly return the sum of all sales (QUANTITY_SOLD and AMOUNT_SOLD) for all products…?
The _________________________ clause groups selected rows on the basis of values of specified column(s) for each row, and returns a single row of summary information for each group