Leetcode 2388. Change Null Values in a Table to the Previous Value

Given an ordered table where some column values are NULL, replace each NULL with the most recent preceding non-NULL value (usually within the same group). This is solved with SQL window functions or correlated subqueries that compute a running "last known" value based on the row order (and handle leading NULLs appropriately).

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Leetcode 2388. Change Null Values in a Table to the Previous Value

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