Which of the following are correct statements about Primary Key of a table? Prim

Question

Which of the following are correct statements about Primary Key of a table? Primary Key uniquely identifies a row in the table It is possible that the primary key can be combination of multiple columns the value of a column which is constituent of the primary key cannot be null Primary key columns can accept only numeric values Please study the data in the table below, and based on the data in the table, identify the column that can NOT be the primary key. Please note that the first row of the table contains names for the columns of the table. It is possible that a foreign key column of a table can be NULL. True False

Explanation / Answer

Question 1:

Answer:

A. A primar key uniquel identifies a row in a the table.

B. It is possible that primary key can be a combimation of multiple columns.

Quetion 2:

Answer:

SUCCESS_NUMBER

SUCCESS_NUMBER column can not be primary key since it has some duplicate values. Primary key is nothing bt uniqe and not null.

Question 3:

Answer:

True.

It is possible that a foreign key column of a tabele can be NULL.

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