I want Use Lag Function By Using Running Total in Another Column, But It is Not Work in SQL Server 2012??? : [enter image description here][1]


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  [1]: https://i.stack.imgur.com/64ke7.png
  [2]: https://i.stack.imgur.com/nWQJV.png


I want Use Lag Function By Using Running Total in Another Column, But  It is Not Work  in SQL Server 2012??? 