what is the difference between primary key & foreign key?
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Answer Posted / vaziuddin shaik
PRIMARY KEY
-------------
Primary key is a column in a table which is having unique
values......and it does not contain null values and
duplicate values...........
FOREIGN KEY
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Foreign key is a column in a table which act as reference to
another table.....and it may contain null and duplicate
values.....(or)it may not contain null and duplicate
values...........
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