Want result in SQL query

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I have two column in Sql Table
and want result in third column Like This
in This Column When Bill Is entered it will add in Balance and show in third column same as when Payment Paid it will Less from Balance

		Bill	  Paid	     Balance	
1		75	      0	        75	
2		0	      50	    25	
3		780	      0	        805	
4		500	      0	        1305	
5		0	      1000	    305	
6		780	      0	        1085	
7		77	      0 	    1162

What I have tried:

SELECT  [Bill] ,[Paid] ,[Bill]-Paid  as Balance  FROM [CsLedg]

and showing which is not Ok for me

<pre>
		Bill	  Paid	     Balance	
1		75	      0	        75	
2		0	      50	    -50	
3		780	      0	        780	
4		500	      0	        500	
5		0	      1000	    -1000
6		780	      0	        780	
7		77	      0 	    77

Posted 20-Dec-20 16:07pm

Naqash Younis

Updated 20-Dec-20 21:24pm

v3

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2 solutions

Solution 1

You need a running balance, which means either a self join, or using LAG (Transact-SQL) - SQL Server | Microsoft Docs[^]

Posted 20-Dec-20 20:39pm

OriginalGriff

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Maciej Los · Accepted Answer · 2020-12-20T21:24:00

Take a look here: Calculating Running Total with OVER clause and Partition By Clause in SQL Server[^]

So, in your case it should be like this:

SQL

CREATE TABLE CsLedg
(
  LedgId int IDENTITY(1,1),
  Bill int,
  Paid int
);

INSERT INTO CsLedg(Bill, Paid)
VALUES(75, 0),
(0, 50),
(780, 0),
(500, 0),
(0, 1000),	
(780, 0),
(77, 0);

SELECT LedgId, Bill, Paid, SUM(Bill-Paid) OVER(ORDER BY LedgId) As Balance
FROM CsLedg

SQL Server 2019 | db<>fiddle[^]

More examples:
Use SQL to Calculate a Running Total - Essential SQL[^]
4 Ways to Calculate a Running Total With SQL[^]