A.It allows the renaming of columns in a table.

B.It improves query execution time.

C.It provides a consistent reference to database objects, even if their underlying names change.

D.It enforces constraints on table columns.

A.NULL values represent missing or unknown data.

B.NULL values are not allowed in relational databases.

C.NULL values are treated as zero.

D.NULL values are treated as empty strings.

A.INTERVAL MINUTE TO HOUR

B.INTERVAL DAY TO SECOND

C.INTERVAL YEAR TO MONTH

D.INTERVAL MONTH TO DAY

A.Deletes all rows in the table without logging the operation for rollback

B.Deletes the table structure permanently

C.Deletes only the last row in the table

D.Deletes all rows in the table and logs the operation for rollback

A.Returns rows from the first query that are not present in the second query

B.Returns rows that are present in both queries

C.Combines all rows from two queries without any conditions

D.Combines rows from two queries and includes all duplicates