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
GSM及CDMA频率频点换算小工具 全球CDMA频段分配情况及中国电信频点分配 常见的频段资源如下： Band Class 0 US Cellular MS: 824.025 MHz – 848.985 MHz, BS: 869.025 MHz – 893.985 MHz Band Class 1 North American PCS MS: 1850 MHz – 1910 MHz, BS: 1930 MHz – 1990 MHz Band Class 2 TACS Band MS: 872.
