Answer / harish

the primary key defines the uniqueness of the table.

Let's take the example.MARA..the unique key or the primary key is MATERIAL number.So you cannot have two records of the same material number..the primary key is used to avoid duplicates..

By setting a foreign key brings a relation between two tables..

Let's take the example..VBAP-MATNR it has got the foreign key to the table MARA...so that you cannot enter a value which is not in the table MARA.

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