SQL Server LAST_VALUE Function
SQL Server LAST_VALUE function is a Analytic function which returns the Last value in an ordered set of values.
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Analytic Functions
SQL Server Analytic functions calculate an aggregate value based on a group of rows. Unlike aggregate functions, however, analytic functions can return multiple rows for each group.
SQL Server FIRST_VALUE Function
SQL Server FIRST_VALUE function is a Analytic function which returns the first value in an ordered set of values.
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SQL Server Lag Function
SQL Server LAG() function is a Analytics Functions that provides access to a row at a given physical offset that comes before the current row.
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SQL Server Lead Function
SQL Server LEAD() function is a Analytics function that provides access to a row at a specified physical offset which follows the current row.
Basically, LEAD() function provides access to a row at a given physical offset that follows the current row.
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