西门子2013年最新授权 v2013.05.26 add some info for WinCC v7.2 1737 keys v2013.05.26 add some info for WinCC v7.2 v2013.03.08 fix 1 key for TIA Portal v12 v2013.03.03 add TIA Portal v12, S7-Technology, fix Unicode bug for some new keys folder v2013.03.01_tes
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