oracl 和db2 常用语法比较： 1、取前N条记录 Oracle：Select * from TableName where rownum <= N; DB2：Select * from TableName fetch first N rows only; 2、取得系统日期 Oracle：Select sysdate from dual; DB2：Select current timestamp from sysibm.sysdummy1; 3、空值转换 Oracle：Select
数字开关电源的设计与实现pdf,数字开关电源的设计与实现广东工业大学硕士学位论文
Abstract
Power is an important component of electronic equipment, electronic equipment
directly affects the quality of the work, so more and more attention. with the power
electronics industry, electronic equi
