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入门到精通,掌握这些SQL语句让你成功玩转数据库!
20. 如何使用游标对数据库进行操作? 当游标被创建后,可以使用 SELECT 语句来选择游标所指向的数据,并使用 FETCH 语句来获取该数据,然后使用条件语句来决定是否继续获取数据。下面是一个示例: 可以使用 ROW_NUMBER 函数对数据表进行排序,然后使用窗口函数 ...
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