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Primary key In SQL ?
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maharanacab

Newborn

Newborn
Posts: 2
Posted: Sat Sep 21, 2019 7:21 am

Hello Dear,

Please Tell Me What is the Primary key In SQL ?

Rscomponent18

Guru

Guru
Posts: 114
Posted: Mon Sep 23, 2019 11:31 am

A primary key is a field in a table which uniquely identifies each row/record in a database table. Primary keys must contain unique values. A primary key column cannot have NULL values. A table can have only one primary key, which may consist of single or multiple fields.

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