Getting the previous row value in SQL SERVER

Question

Hello everyone, please refer to the image below How can I get the NewRequest value to store it to the PrevRequest?

Asma Khalid · Answer

You can use SQL server function LAG which is available in SQL SERVER 2012 or above i.e. SELECT [RS No ], [BudgetName], [BudgetAmount], (LAG(NewRequest) OVER ( ORDER BY [RS No ] ASC )) AS [PrevRequest] , [NewRequest], [Balance] FROM MyTable Mark answer as accepted if helpful Thanks & Regards, Asma Khalid For More Visit: www.asmak9.com or www.bytezaar.com

Satya Karki · Answer

Hi, if your SQL Server is 2012 or later version you can simply use LAG() function. Try this: SELECT *, Lag(NewRequest, 1) OVER(. ORDER BY NewRequest ASC ) AS PrevRequest FROM @TableName;

Rijwan Ansari · Answer

SQL Server LAG() is a window function that gives access to a row at a specified physical offset which comes before the current row. In other words, by using the LAG() function, from the current row, you can access data of the previous row, or the row before the previous row, and so on. Check this example: https://blog.sqlauthority.com/2013/09/22/sql-server-how-to-access-the-previous-row-and-next-row-value-in-select-statement/

Kiran Mohanty · Answer

Hi, You can fetch data in data table and then you can read any row and column based on index. Example for ( int index=0; index { string newRequest= DataTbl.Rows[index][ "NewRequest" ]; string prevReq = index > 0 ? DataTbl.Rows[index-1][ "NewRequest" ] : "" ; }