What do you need if you should enforce many-to-many relationship between two tables?

A. MySQL

B. MongoDB

C. PostgreSQL

D. Oracle

A. Deletes all rows from a table without logging individual row deletions

B. Deletes only duplicate records

C. Removes table structure

D. Backs up the table

A. GROUP BY

B. ORDER BY

C. HAVING

D. WHERE

A. ORDER BY

B. GROUP BY

C. HAVING

D. FILTER

A. DISTINCT

B. UNIQUE

C. REMOVE

D. EXCLUDE