--更新历程权力值--1.查询效率慢的update FW_WF_COURSE c set c.power =(select distinct from jbpm_taskinstance t1 where t1.id_ = c.task_id)where c.power is null;
--查询效率快create table FW_WF_COU_BP asselect * from ...
简单做一个记录。SELECT COUNT(item_id) FROM 59_dormitem ;#126951SELECT SUM(temp.sum_rid)
FROM
(SELECT
dorm_id,
COUNT(rid) sum_rid
FROM
59_dormitem
GROUP BY dorm_id)
http://www.iteye.com/problems/70150
select stu.stu_NO,stu.name,cou.cou_no,cou.name from s_c sc left join student stu on stu.id=sc.stu_id left join cource cou on cou.id=sc.cour_id where stu.name...
select * from (select tt.,rownum as rowno from (select u.,r.rolename,ur.* from tb_system_user u
left join tb_system_user_role ur on u.id = ur.userid
left join tb_system_role r on r.id = ur.roleid ) tt...
select a.id,a.name,
sum(case when d.STATUS=0 then 1 else 0 end) as 待处理,
sum(case when d.STATUS=1 then 1 else 0 end) as 带跟进,
sum(case when d.STATUS=2 then 1 else 0 end) as 已结束,
sum(case when d.STATUS=3 then 1 else 0 end) as 已完成
from D d,A a
where a.id = d.Aid (d<em>表</em>的Aid和a<em>表</em>的id对应,但d<em>表</em>有多条数据的Aid=a.id)
group by a.id
select a.id,a.name as 处理人,c.name as 所属机构
from A a,B b,C c
where a.id = b.Aid and c.id = b.Cid (B<em>表</em>是<em>中间</em><em>表</em>，只存放a<em>表</em>的ID和c<em>表</em>的ID)
就是把这两个sql语句写在一个里面
--创建用户create user han identified by han default tablespaceusers Temporary TABLESPACE Temp;grant connect,resource,dba to han; //授予用户han开发人员的权利--------------------对<em>表</em>的操作----------------------------创建<em>表</em>c
create user <em>中间</em>库用户名 identified by 密码;
grant create session to <em>中间</em>库用户名;
grant connect to <em>中间</em>库用户名;
grant create synonym to 用户名 with admin option; --赋同义词权限
grant select on 主用户.公用<em>表</em><em>表</em>名 to <em>中间</em>库用户名;
grant in
mysql出现错误“ Every derived table must have its own alias”
Every derived table must have its own alias
这句话的意思是说每个派生出来的<em>表</em>都必须有一个自己的别名
一般在多<em>表</em>查询时，会出现此错误。
因为，进行嵌套查询的时候子查询出来的的结果是作为一个派生<em>表</em>来进行上一级的查询的，所
首先跟大家说明一点，我们做 IT 类的外包开发，是非标品开发，所以很有可能在开发过程中会有这样那样的需求修改，而这种需求修改很容易造成扯皮，进而影响到费用支付，甚至出现做完了项目收不到钱的情况。
那么，怎么保证自己的薪酬安全呢？
我们在开工前，一定要做好一些证据方面的准备（也就是“讨薪”的理论依据），这其中最重要的就是需求文档和验收标准。一定要让需求方提供这两个文档资料作为开发的基础。之后开发...
Real-Time Communication with WebRTC 源码
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