Moves the cursor forward one row.
True, if the cursor successfully moves forward. Despite returning true, an error may be signaled even when the cursor moves successfully to the next row. For example, there could be conversion errors while evaluating the SELECT expressions. In this case, errors are also returned when retrieving the column values.
False, if it fails to move forward. For example, there may not be a next row. In this case, the resulting cursor position is AfterLast function.
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