LAG Operator

The LAG operator is a tool used in data analysis to compare a current data point with a previous one in a sequence, such as time series data. It helps identify changes or trends over time by "looking back" at earlier values without altering the original data order. For example, it can show how sales this month compare to sales last month. LAG is commonly used in SQL and data processing to analyze patterns, detect shifts, or calculate differences between sequential data points, making it easier to understand trends and changes over time.