Question

Reference data can be fetched on demand using ___________.

Answer 1

Reference data can be fetched by these both the keys

primary key

        In SQL, a primary key is a single field that have a unique value in the table. No null values and zero or allowed in the table.  A table can have only one primary key. The table contains a primary key is also called as the parent key.

A FOREIGN KEY is a key used to link two tables together.

A FOREIGN KEY is a field (or collection of fields) in one table that refers to the PRIMARY KEY in another table.

The table containing the foreign key is called the child table, and the table containing the candidate key is called the referenced or parent table.  

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