而在性能方面，只能前进的游标优于可滚动游标。
In terms of performance, the forward-only cursor is better than the scrollable cursor.
可滚动结果集允许游标移动到结果集中的任意行。
A scrollable result set allows the cursor to be moved to any row in the result set.
在远程过程上不支持可更新、可持有和可滚动的游标。
Updatable, holdable, and scrollable cursors on remote procedures are not supported.
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