Any body explain primary key function

Answer 1

Primary key is used to maintain uniqueness of the data item.....

Answer 2

it is a Combination of unique and not null constraints ,a table has only one primary key which will create the auto index for the primary key selection

Answer 3

Primary key is used to assure the uniqueness of a record

Answer 4

Hello there,Primary key is basically a field which cannot be same and its unique.

For example a students table will have id,name,roll_no fields and so the id field can be primary key .It can be used to perform operations using php for e.g "DELETE FROM 'students' WHERE id=" . $_GET['id'] ;

Answer 5

a must have in a database, without a primary key, it will be a real mess to retrieve information from your database.

Answer 6

primary key simply means unique

Answer 7

it's a constraint in which a table must have it
it doesn't allows nulls and it is unique
with this key we can easily retrieve the data from table

Answer 8

It is unique key to access the data

Answer 9

i think your wrong

Answer 10

primary key =unique + null