Question: Retrieve all of the fields from the ENROLLMENT table. For null entries, output two dashes (--), for all other grades, show two asterisks (**). In
Retrieve all of the fields from the ENROLLMENT table. For null entries, output two dashes (--), for all other grades, show two asterisks (**). In addition, also show the students first and last name. Order the output by last name, firstname as shown. (Hint: NVL2 function.)
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