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QusWhat is the purpose of the SQL LAG() window function? Qus
A. Returns the next value in a result set based on a specified order
B. Calculates the average value for each group of rows
C. Retrieves the previous value in a result set based on a specified order
D. Performs a left outer join between tables
Solution
C. Retrieves the previous value in a result set based on a specified order
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