1·Every SQL record has its own Unique Sequence Number, and you can also compute a custom unique number for all combined fields in the record.
每一条 SQL 记录都有它自己的惟一序号，您可以为记录中的所有组合字段计算一个定制的惟一编号。
2·This internal sequence number is reset to 0 if an unavailable event was detected.
如果探测到不可用事件，那么这个内部序号复位为 0。
3·If you do not specify a sequence number, the system retrieves the most recently run command.
如果不指定序号，那么系统会检索最近运行的命令。
4·The sample program maintains its own internal sequence number.
示例程序维护自己的内部序号。
5·Register the sequence number, interrupt nature, and thread attributes to the main program.
向主程序注册序号、中断属性和线程属性。