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Part 109 - Row_Number function in SQL Server
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(追記) (追記ここまで)
In this video we will discuss how to calculate running total in SQL Server 2012 and later versions.
(追記) (追記ここまで)
We will use the following Employees table for the examples in this video.
running total sql server
SQL Script to create Employees table
CreateTableEmployees
SQL Query to compute running total without partitions
calculate running total in SQL Server 2012
SQL Query to compute running total with partitions
SELECTName,Gender,Salary,
running total column
What happens if I use order by on Salary column
If you have duplicate values in the Salary column, all the duplicate values will be added to the running total at once. In the example below notice that we have 5000 repeated 3 times. So 15000 (i.e 5000 + 5000 + 5000) is added to the running total at once.
So when computing running total, it is better to use a column that has unique data in the ORDER BY clause.
Part 109 - Row_Number function in SQL Server
Part 110 - Rank and Dense_Rank in SQL Server
Part 111 - Difference between rank dense_rank and row_number in SQL
(追記) (追記ここまで)
In this video we will discuss how to calculate running total in SQL Server 2012 and later versions.
(追記) (追記ここまで)
We will use the following Employees table for the examples in this video.
running total sql server
SQL Script to create Employees table
CreateTableEmployees
(
Id int primary key,
Name nvarchar(50),
Gender nvarchar(10),
Salary int
)
Go
Insert Into Employees Values (1, 'Mark', 'Male', 5000)
Insert Into Employees Values (2, 'John', 'Male', 4500)
Insert Into Employees Values (3, 'Pam', 'Female', 5500)
Insert Into Employees Values (4, 'Sara', 'Female', 4000)
Insert Into Employees Values (5, 'Todd', 'Male', 3500)
Insert Into Employees Values (6, 'Mary', 'Female', 5000)
Insert Into Employees Values (7, 'Ben', 'Male', 6500)
Insert Into Employees Values (8, 'Jodi', 'Female', 7000)
Insert Into Employees Values (9, 'Tom', 'Male', 5500)
Insert Into Employees Values (10, 'Ron', 'Male', 5000)
Go
SQL Query to compute running total without partitions
SELECT Name, Gender, Salary,
SUM(Salary) OVER (ORDER BY ID) AS RunningTotal
FROMEmployeescalculate running total in SQL Server 2012
SQL Query to compute running total with partitions
SELECTName,Gender,Salary,
SUM(Salary) OVER (PARTITION BY Gender ORDER BY ID) AS RunningTotal
FROM Employeesrunning total column
What happens if I use order by on Salary column
If you have duplicate values in the Salary column, all the duplicate values will be added to the running total at once. In the example below notice that we have 5000 repeated 3 times. So 15000 (i.e 5000 + 5000 + 5000) is added to the running total at once.
SELECT Name, Gender, Salary,
SUM(Salary) OVER (ORDER BY Salary) AS RunningTotal
FROM EmployeesSo when computing running total, it is better to use a column that has unique data in the ORDER BY clause.
8 comments:
Hi Venkat
Reply Deletecan you explain about sequence
How do we do in 2008 , Can you please explain the same query in below versions of 2012.
Reply DeleteQuery not working as shown in your video
Reply DeleteWhen executing below given Query:
SELECT Name, Gender, Salary,
SUM(Salary) OVER (ORDER BY ID) AS RunningTotal
FROM Employees
following error Showing:
Msg 102, Level 15, State 1, Line 2
Incorrect syntax near 'order'.
'D' Will be small 'd'. Look here what you initialize :- "Id int primary key"
DeleteThe small 'd' isn't the one making difference (since sql server variables are case insensitive)
DeleteBUT the version of sql server,
I guess it is below 2012 (in which this feature was launched)
In case of duplicate salary use below query
Reply DeleteSELECT Name, Gender, Salary,
SUM(Salary) OVER (ORDER BY Salary Rows Between UNBOUNDED FOLLOWING and CURRENT ROW ) AS RunningTotal
FROM Employees
When executing below given Query:
Reply DeleteSELECT Name, Gender, Salary,
SUM(Salary) OVER (ORDER BY ID) AS RunningTotal
FROM Employees
following error Showing:
Msg 102, Level 15, State 1, Line 2
Incorrect syntax near 'order'.
SELECT Name, Gender, Salary,
Reply DeleteSUM(Salary) OVER (ORDER BY ID) AS RunningTotal
FROM Employees
following error Showing:
Msg 102, Level 15, State 1, Line 2
Incorrect syntax near 'order'.
Please Guide i have also updated sql server
It would be great if you can help share these free resources
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