Design a mapping to get the pervious row salary for the current row. If there is no pervious row exists for the current row, then the pervious row salary should be displayed as null.
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SOURCE NAME SAL GANGA 30000 RAJU 20000 PAVAN 25000 TARGET NAME SAL MAXSAL GANGA 30000 30000 RAJU 20000 30000 PAVAN 25000 30000 in mapping level how to achive that
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