select )) h, )) m, )) s from gat_data_record gdr where gdr.enddt between to_date('2011-1-1','yyyy-mm-dd') and to_date('2014-2-1','yyyy-mm-dd') 1.获得时间差毫秒数: select ceil((To_date('2008-05-02 00:00:00' , 'yyyy-mm-dd hh24-mi-ss') - To_date('2008-04-30 23:
select * from ( selectclass 班级,subject,avg(grade) avg_gradefrom student_score group by class,subject) pivot (sum(avg_grade) for subject in ('语文', '数学','英语')) order by 班级 asc 求班级平均分select 学科,平均分 别名 from 表where class="121"就是group by 班级,平均分 1.121班的
--根据每个部门来统计部门工资总和 select deptid, sum(sal) 工资合计 from emp group by deptid; --根据每个部门来统计部门工资总和select deptid, 工资合计, sum(工资合计) over() as 总合计 from (select deptid, sum(sal) 工资合计 from emp group by deptid) x; select deptid 部门, 工资合计, 总
select size_for_estimate, buffers_for_estimate ,ESTD_PHYSICAL_READ_factor,ESTD_PHYSICAL_READS from v$db_cache_advice 2 where block_size='8192' and advice_status='ON'; 中,size_for_estimate表示预计的数据库高速缓冲区的大小(即:db_cache_size的值).ESTD_PHYSICAL_READS表
贪心方案: 答案是第三个策略 二分的一个重点是有顺序性,只有满足这个件才可以二分判断区间,否则你得自己构造顺序. 洛谷跳石头同题: 首先,我们要最小化最大跳远距离 代码如下(此题) #include<cstdio> #include<algorithm> #include<cstring> #define N 300005 using namespace std; int i,j,m,n,p,k,a[N],x;//r为right,l为left int check(int
我自己实现的脚本: select T31267.CREATED_DATE as F31265, (select to_char(to_date(T31267.CREATED_DATE,'yyyy-mm-dd'),'yyyyiw') from dual) as week from LEAP.HMDM_DM_DLR_CLUE T31267 总结: select to_char(TO_DATE('20110101', 'YYYYMMDD'), 'yyyyiw') as week, --oracle求
A peak element is an element that is greater than its neighbors. Given an input array where num[i] ≠ num[i+1], find a peak element and return its index. The array may contain multiple peaks, in that case return the index to any one of the peaks is fi
oracle数据库对test_table表的三个列count1,count2,count3求sum的两种sql,做个记录 第一种 select sum (case when count1 is not null then count1 when count2 is not null then count2 when count3 is not null then count3 else '0' end ) a from test_table 第二种 select sum(decode(count
oracle 的分析函数有很多,但是这个函数总是会忘记,我想通过这种方式能让自己记起来,不至于下次还要百度. 创表.表数据(平时练手的表): prompt PL/SQL Developer import file prompt Created on 2018年7月5日 星期四 by Administrator set feedback off set define off prompt Creating CKX001... create table CKX001 ( ID VARCHAR2(20