In this tutorial, I am going to explain you about Row Number Function in SQL Server. This is built-in Ranking Function provided by SQL Server for assigning a sequence number to records in a result set.
Row Number in SQL Server:
ROW_NUMBER is a built-in SQL Server function that is used to show sequence number for each record in a result set. ROW_NUMBER generates a run-time column that generates a Serial Number for each Record in the result set.
Syntax:
Row_Number() over (order by col1, col2, ....coln partition by col1, col2, ....coln)
Where;
Order By(Required): Row Number generates by the column provided in Order By clause.
Partition(Optional): It is similar to group by clause. It groups the result based on the column provided in the partition by clause. Where sequence starts with 1 for every group.
Example of Row Number:
Before starting Let’s create a table and insert some demo records.
Create Table:
CREATE TABLE [dbo].[Employee]( [EmployeeID] [bigint] IDENTITY(1,1) NOT NULL, [EmployeeName] [varchar](100) NULL, [Gender] [varchar](50) NULL, [Designation] [varchar](50) NULL, [Salary] [float] NULL, [City] [varchar](100) NULL ) ON [PRIMARY] GO
Insert Records:
SET IDENTITY_INSERT [dbo].[Employee] ON GO INSERT [dbo].[Employee] ([EmployeeID], [EmployeeName], [Gender], [Designation], [Salary], [City]) VALUES (1, N'Ahwin Roy', N'Male', N'Software Engineer', 800000, N'Varanasi') GO INSERT [dbo].[Employee] ([EmployeeID], [EmployeeName], [Gender], [Designation], [Salary], [City]) VALUES (2, N'Ritesh Shah', N'Male', N'Team Leader', 900000, N'New Delhi') GO INSERT [dbo].[Employee] ([EmployeeID], [EmployeeName], [Gender], [Designation], [Salary], [City]) VALUES (3, N'Richa Singh', N'Female', N'DBA', 1200000, N'Allahabad') GO INSERT [dbo].[Employee] ([EmployeeID], [EmployeeName], [Gender], [Designation], [Salary], [City]) VALUES (4, N'Tripti Sinha', N'Female', N'Tester', 700000, N'Mumbai') GO INSERT [dbo].[Employee] ([EmployeeID], [EmployeeName], [Gender], [Designation], [Salary], [City]) VALUES (5, N'Nitin Pandey', N'Male', N'Web Developer', 8000000, N'Pune') GO SET IDENTITY_INSERT [dbo].[Employee] OFF GO
Example 1:
Below is an example that would assign Sequence Number for all Employees.
SELECT [EmployeeID], [EmployeeName], [Gender], [Designation],[Salary],[City] , row_number() over (order by [EmployeeID]) as Seqence FROM [dbo].[Employee]
Output:
Look at the output screen where a Sequence Number assign for each EmployeeID which is provided in Order By.
Let’s see an example for order by with multiple columns
SELECT [EmployeeID], [EmployeeName], [Gender], [Designation],[Salary],[City] , row_number() over (order by [EmployeeName],[Designation]) as Seqence FROM [dbo].[Employee]
Output:
Example 2:
In this example, we will see how to use Partition By clause with Row Number.
SELECT [EmployeeID], [EmployeeName], [Gender], [Designation],[Salary],[City] , row_number() over (partition by Gender order by EmployeeID) as Seqence FROM [dbo].[Employee]
Output:
Look at the output window where Sequence is started from 1 for each group i.e. for gender which is provided in the partition by clause.
View More:
Conclusion:
I Hope you loved this post. I would happy to receive your feedback and comments.
Thank You.
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