| Pick the correct statement for a PRIMARY KEY constraint?
Choose the correct option from below list
(1)Primary key defines a realtionship between two tables.
(2)A table in SQL must have a primary key associated with it to uniquely identify its records.
(3)A table in SQL is indexed by default based on its primary key.
(4)Primary key may or may not be unique but can be comprised of multiple fields.
Answer:-(3)A table in SQL is indexed by default based on its primary key. | | |