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Compare window functions to Grouping. Windowing and Grouping are conceptually related by also different. It is helpful to understand this relationship. This tutorial shows you how to use the SQL LAG() function to access data of the previous row from the current row.

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Window Functions В« Analytical Functions В« Oracle PL/SQL Tutorial. Window Functions В« Analytical Functions В« Oracle PL/SQL Tutorial. Oracle PL/SQL Tutorial sql documentation: Window Functions Related Examples. Adding the total rows selected to every row; Finding "out-of-sequence" records using the LAG() function

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