Question

Define Primary key. Why do we need a Primary key?​

Answer 1

Answer:

Hope this will help u please mark it as brainlist

Explanation:

A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records.

A primary key's main features are: It must contain a unique value for each row of data. It cannot contain null values.

Answer 2

HEY MATE

$\huge\boxed{ \fcolorbox{red}{yellow}{Primary Key}}$

➡A primary key is special database table column.

➡It is designated to uniquely identify all table records

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√It must contain a unique value for each row of data.

√ It cannot contain null values.

✏Primary key uniquely identify a record in the table.

2)- A primary key allows you to uniquely and unambiguously reference every “cell” — i.e., intersection of row and column — in a table in a database, the same way that row and column addresses uniquely reference every cell in a spreadsheet.

So we need a primary key!