What is Row_Number() in SQL ?

Hello everyone, today I am going to discuss the Row_number feature in SQL server.

what is Row_Number()?

Row_Number is used to generate the number of each row dynamically in a sequential order based on some column orders.

Row_Number() must be used with order by clause, without order by we can not use the Row_Nuber function.

Row_Number() over(order by EmpName) as RowNumber

Example:

Generate unique Id for each row dynamically: – In case if the table does not have a primary key or any unique identification number. you can use Row_Number to provide the unique ID for a table.

select 
Row_Number() over(Order by EmailId) as Id,
EmailId,FirstName,LastName 
from 
Employee

Output from the above SQL Query
Row_Number_UniqueId

 

 

 

 

 

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