oracle使用总结（汇总）

有些特殊情况，需要手动修改数据库中的数据，在此总结！

查询前10行数据&手动更新

select * from sbpopt.tt_repair_part WHERE ROWNUM <= 10 for update;
commit;

截取某个字段前两位（所有行）

select * from tt_presale_sales_repair
update tt_presale_sales_repair set series_code=substr(series_code,1,2)
commit;

根据日期字段查询：最大值、最小值

select max(to_char(retail_time,'yyyy-mm-dd hh24:mi:ss')),min(to_char(retail_time,'yyyy-mm-dd hh24:mi:ss')) from tt_test where brand_id='200'

Oracle存储过程

create or replace procedure p1--无参数列表时，不需要写()
as
begin
  dbms_output.put_line('hello world');
end;

--执行存储过程方式1
set serveroutput on;
begin
  p1();
end;
--执行存储过程方式2
set serveroutput on;
execute p1();

示例：

CREATE OR REPLACE PACKAGE DACU.ASMP_REPORT AS
       procedure DELETE_DATA;
END ASMP_REPORT;
/

CREATE OR REPLACE PACKAGE BODY DACU.ASMP_REPORT
AS
       procedure DELETE_DATA
       IS
       BEGIN
	delete from DACU.TT_PRESALE_SALES_VOLUME where create_date >=  ADD_MONTHS(TRUNC(SYSDATE - 1, 'MM'), -1);
    delete from DACU.TT_PRESALE_SALES_REPAIR where type='1' and create_date >= ADD_MONTHS(TRUNC(SYSDATE - 1, 'MM'), -1);
    delete from DACU.TT_PRESALE_SALES_REPAIR where type='2' and create_date >= TRUNC(SYSDATE - 1, 'YYYY');
    
    delete from DACU.TT_PRESALE_SALES_VOLUME where DATE_YM >= to_char(ADD_MONTHS(TRUNC(SYSDATE - 1, 'MM'), -1),'yyyymm');
    delete from DACU.TT_PRESALE_SALES_REPAIR where type='2' and DATE_YM >= to_char(ADD_MONTHS(TRUNC(SYSDATE - 1, 'MM'), -1),'yyyymm');
    delete from DACU.TT_PRESALE_SALES_REPAIR where type='1' and DATE_YM >= to_char(TRUNC(SYSDATE - 1, 'YYYY'),'yyyy');
       COMMIT;
       END DELETE_DATA;

END ASMP_REPORT;
/  

declare
  job number;
begin
SYS.DBMS_IJOB.SUBMIT(102,'DACU','DACU','DACU',
to_date('2020-07-08 02:00:00','YYYY-MM-DD HH24:MI:SS'),'TRUNC(SYSDATE+1))+1/12',false,'DACU.ASMP_REPORT.DELETE_DATA;',
'NLS_LANGUAGE="SIMPLIFIED CHINESE" NLS_TERRITORY="CHINA" NLS_CURRENCY="￥" NLS_ISO_CURRENCY="CHINA" NLS_NUMERIC_CHARACTERS=".," NLS_DATE_FORMAT="yyyy-mm-dd hh24:mi:ss" NLS_DATE_LANGUAGE="SIMPLIFIED CHINESE" NLS_SORT="BINARY"',
'0102000200000000');
commit;
end;
/

Oracle函数

create or replace function f1 return varchar--必须有返回值
as
  msg varchar(50);
begin
   msg := 'hello world';
   return msg;
end;

--执行函数方式1
select f1() from dual;
--执行函数方式2
set serveroutput on;
begin 
  dbms_output.put_line(f1());
end;

备注：存储过程和函数区别：
存储过程不能使用return返回值
函数一般倾向于逻辑判断，存储过程倾向于事务处理

oracle的pivot函数和unpivot函数

select nation,city,ranking from temp 
pivot (max(city) for ranking in ('第一' as 第一,'第二' AS 第二,'第三' AS 第三));

select nation,name,title from temp 
unpivot (name for title in (第一,第二,第三,第四))t

查看定时任务 DBMS_Jobs