Explanation: Varchar changes its length accordingly whereas char has a specific length which has to be filled by either letters or spaces. 7. To remove a relation from an SQL database, we use the ______ command.
A. Delete
B. Purge
C. Remove
D. Drop table
Answer:A
Explanation: Varchar changes its length accordingly whereas char has a specific length which has to be filled by either letters or spaces. 7. To remove a relation from an SQL database, we use the ______ command.
A. Delete B. Purge C. Remove D. Drop table
Explanation: Drop table deletes the whole structure of the relation .purge removes the table which cannot be obtained again. 8. Delete from r; r – relation