Unlike elapsed time, in case of a declare cursor statement the CPU time is the sum of open, all fetched and close.
与消耗时间不同，对于声明游标的语句，CPU时间是打开游标、所有读取操作和关闭游标的时间总和。
Definition of the required cursor does not occur separately by executing DECLARE cursor.
不需要通过执行DECLARE CURSOR单独定义所需的游标。
Instead, the remote database is just specified in the DECLARE CURSOR statement using the database option.
只需使用DATABASE选项在DECLARE cursor语句中指定远程数据库。
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