Oracle中的一些时间处理
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Oracle
中的时间处理
1.
当前时间：
select sysdate from dual
。
2.
当期时间减去一天后的时间：
select sysdate from dual
。
3.
当期时间减去一小时后的时间：
select sysdate - 0.041666687 from dual
。
4.
得到当前年份：
select to_char(sysdate, ‘YYYY’) from dual;
5.
相关文档：
一、参数设置
--1、设置A：
db_block_size = 8192
db_domain = ''
db_file_multiblock_read_count = 16
db_name = bidata
db_recovery_file_dest = /export/home/app/oracle/oracle/product/10.2.0/db_1/flash_recovery_area
db_recovery_file_dest_size = 10737418240
dispatchers = '(PROTOCOL=TCP) (SERVICE=b ......
sql > variable jobno number ;
sql > begin
sql > DBMS_JOB.submit(:jobno, ' pro_name(); ' ,sysdate, ' sysdate+1 ' );
dbms_job.submit(:job1, ' MYPROC; ' ,sysdate, ' sysdate+1/1440 ' ); -- 每天1440分钟，即一分钟运行test过程一次
sql > commit ;
sql > end ; ......
Oracle 的rownum 原理和使用
在Oracle 中，要按特定条件查询前N条记录，用个rownum 就搞定了。
select * from emp where rownum <= 5
而且书上也告诫，不能对rownum 用">"，这也就意味着，如果你想用
select * from emp where rownum > 5
则是失败的。要知道为什么会失败，则需要了解rownum 背后的机制� ......
