- select substr("DOC_CREATE_TIME", 0,6),
- (select fd_name from sys_org_element c where c.fd_id=a.fd_name),
- (select fd_name from sys_org_element where fd_id=fd_bumen),
- to_date(substr("FD_RIQI", 0,9),'fmdd month yy'),
- to_date(substr("FD_LIZHITIME", 0,9),'fmdd month yy'),
- FD_CZYUANYIN from ekp_1lizhi a,km_review_main b where a.FD_ID = b.FD_ID order by 1 desc;
2.日期到字符操作
- select sysdate,to_char(sysdate,’yyyy-mm-dd hh24:mi:ss’) from dual
- select sysdate,to_char(sysdate,’yyyy-mm-dd hh:mi:ss’) from dual
- select sysdate,to_char(sysdate,’yyyy-ddd hh:mi:ss’) from dual
- select sysdate,to_char(sysdate,’yyyy-mm iw-d hh:mi:ss’) from dual
参考oracle的相关关文档(ORACLE901DOC/SERVER.901/A90125/SQL_ELEMENTS4.HTM#48515)
3. 字符到日期操作
- select to_date(’2003-10-17 21:15:37’,’yyyy-mm-dd hh24:mi:ss’) from dual
具体用法和上面的to_char差不多。
4. trunk/ ROUND函数的使用
- select trunc(sysdate ,’YEAR’) from dual
- select trunc(sysdate ) from dual
- select to_char(trunc(sysdate ,’YYYY’),’YYYY’) from dual
5.oracle有毫秒级的数据类型
--返回当前时间 年月日小时分秒毫秒
select to_char(current_timestamp(5),’DD-MON-YYYY HH24:MI:SSxFF’) from dual;
--返回当前 时间的秒毫秒,可以指定秒后面的精度(最大=9)
select to_char(current_timestamp(9),’MI:SSxFF’) from dual;
6.计算程序运行的时间(ms)
- declare
- type rc is ref cursor;
- l_rc rc;
- l_dummy all_objects.object_name%type;
- l_start number default dbms_utility.get_time;
- begin
- for I in 1 .. 1000
- loop
- open l_rc for
- ’select object_name from all_objects ’||
- ’where object_id = ’ || i;
- fetch l_rc into l_dummy;
- close l_rc;
- end loop;
- dbms_output.put_line
- ( round( (dbms_utility.get_time-l_start)/100, 2 ) ||
- ’ seconds...’ );
- end;