what is mean by prmary key and foreign key and how can we
diffrentiate that?
Please answer me.
Advance thanks.
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Answer Posted / ysailajasantosh
Primary key means a unique key which is constant.
A foreign key (FK) is a column or combination of columns
that is used to establish and enforce a link between the
data in two tables. You can create a foreign key by
defining a FOREIGN KEY constraint when you create or modify
a table.
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