🚀 SQL Analytical Function : Part IV — LEAD() & LAG() 📊 Understanding how data changes across rows is a common requirement in analytics. In this part, I break down LEAD() and LAG(), which help ...
LAG ( scalar_expression [, offset ] [, default ] ) OVER ( [ partition_by_clause ] order_by_clause )) scalar_expression: The value to retrieve from the previous row. offset: Number of rows before the ...
SELECT e.*, LAG(salary) over(partition by dept_name ORDER BY emp_id) AS Pre_Employee_Sal, LEAD(salary) over(partition by dept_name ORDER BY emp_id) AS Next_Employee ...
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