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
不能直接用rownum,要查询出来以后用别名转换。
以EMP表为范例,取4至10行:
select * from (select rownum id,t.* from emp t) where id between 4 and 10;
有需要排序的,一定要这样处理:
select * from (
select rownum rn,t.* from (
select a.* from eba02 a order by eba003) t where rownum = 110;