Question

Which column is best to replace XXX in the SQL statement below?

CREATE TABLE Supplier ( SupplierID INT AUTO_INCREMENT, CompanyName VARCHAR(40), ContactName VARCHAR(50), Phone VARCHAR(30), PRIMARY KEY (XXX) );

Answer 1

Supplier ID column is best to replace XXX in the SQL statement given.

Step-by-step explanation:

The column "SupplierID" is the best choice to replace XXX in the SQL statement. It is a common practice to use the primary key column as the argument for the PRIMARY KEY constraint. In this case, "SupplierID" is specified as INT and set to AUTO_INCREMENT, making it suitable for a primary key.

Step-by-step explanation:

The PRIMARY KEY constraint uniquely identifies each record in a table, and it is often associated with an AUTO_INCREMENT attribute for automatic incrementing of the key values. In the given SQL statement, the "SupplierID" column is defined as an INT with AUTO_INCREMENT, indicating that it will automatically generate a unique value for each new record. This makes it a suitable choice for the primary key.

Additionally, the primary key should ideally be a column that uniquely identifies each row, and "SupplierID" aligns with this requirement. It is also conventional to name the primary key column with the table name followed by "ID," making it easily recognizable.