Oracle11g 在ORACLE中使用connectby子句 我有下表： 使用以下数据： 所需输出为：

我已尝试使用“按级别连接”

选择64行

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所以，我不知道我应该使用什么以及如何使用。因为每次角色名称不同，级别也不同。有人能告诉我我遗漏了什么吗？

在11g中，只需使用递归分解子查询：

with data (role_name ,  max_cnt, val)
as (select role_name , max_cnt, min_cnt
      from task_2
    union all
    select role_name , max_cnt, val+1
      from data
     where val+1 <= max_cnt)
select role_name || ' there are ' || val
  from data
 order by role_name, val;

示范条款：

with data as (select role_name, min_cnt, max_cnt, max_cnt-min_cnt+1 vals
                from task_2)
select role_name|| ' there are ' || vals
  from data
model
partition by (role_name)
dimension by (0 as i)
measures (vals, min_cnt)
rules (
  vals[for i from 0 to vals[0] increment 1] = min_cnt[0] + cv(i) 
)

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在11g中，只需使用递归分解子查询：

with data (role_name ,  max_cnt, val)
as (select role_name , max_cnt, min_cnt
      from task_2
    union all
    select role_name , max_cnt, val+1
      from data
     where val+1 <= max_cnt)
select role_name || ' there are ' || val
  from data
 order by role_name, val;

示范条款：

with data as (select role_name, min_cnt, max_cnt, max_cnt-min_cnt+1 vals
                from task_2)
select role_name|| ' there are ' || vals
  from data
model
partition by (role_name)
dimension by (0 as i)
measures (vals, min_cnt)
rules (
  vals[for i from 0 to vals[0] increment 1] = min_cnt[0] + cv(i) 
)

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@Naveen_Raj_B没有使用带系数的子查询，事实并非如此。使用connect by可能效率不高。caluse模型也有可能。这是家庭作业，你在这里受限制吗？这是一种训练，是的，限制是使用连接方式。感谢您向我介绍递归分解子查询和MODEL子句。如果你也能给我举一个关于MODEL子句的例子，我会很高兴的。@Naveen_Raj_B没有使用带系数的子查询，它不是。使用connect by可能效率不高。caluse模型也有可能。这是家庭作业，你在这里受限制吗？这是一种训练，是的，限制是使用连接方式。感谢您向我介绍递归分解子查询和MODEL子句。如果你也能给我举一个示范条款的例子，我会很高兴的。

mgr there are 4                                                                                       
mgr there are 4                                                                                       
mgr there are 4                                                                                       
mgr there are 1                                                                                       
mgr there are 4                                                                                       
mgr there are 4                                                                                       
mgr there are 4                                                                                       
mgr there are 4                                                                                       
mgr there are 4                                                                                       
se there are 4                                                                                        
se there are 4                                                                                        
se there are 4                                                                                        
se there are 1                                                                                        
se there are 4                                                                                        
se there are 4                                                                                        
se there are 4                                                                                        
se there are 4                                                                                        
se there are 4                                                                                        
sr_mgr there are 2                                                                                    
sr_mgr there are 3                                                                                    
sr_mgr there are 2                                                                                    
sr_mgr there are 3                                                                                    
sr_mgr there are 2                                                                                    
sr_mgr there are 1                                                                                    
sr_mgr there are 3                                                                                    
sr_mgr there are 2                                                                                    
sr_mgr there are 3                                                                                    
sse there are 5                                                                                       
sse there are 5                                                                                       
sse there are 5                                                                                       
sse there are 5                                                                                       
sse there are 5                                                                                       
sse there are 5                                                                                       
sse there are 3                                                                                       
sse there are 3                                                                                       
sse there are 4                                                                                       
sse there are 5                                                                                       
sse there are 4                                                                                       
sse there are 5                                                                                       
sse there are 5                                                                                       
sse there are 5                                                                                       
sse there are 5                                                                                       
sse there are 5                                                                                       
sse there are 5                                                                                       
sse there are 4                                                                                       
sse there are 5                                                                                       
sse there are 5                                                                                       
sse there are 5                                                                                       
sse there are 4                                                                                       
sse there are 5                                                                                       
sse there are 3                                                                                       
sse there are 4                                                                                       
sse there are 5                                                                                       
sse there are 4                                                                                       
sse there are 5                                                                                       
sse there are 5                                                                                       
sse there are 5                                                                                       
sse there are 1                                                                                       
sse there are 5                                                                                       
sse there are 5                                                                                       
sse there are 3                                                                                       
sse there are 5                                                                                       
sse there are 4                                                                                       
sse there are 4                                                                                       

with data (role_name ,  max_cnt, val)
as (select role_name , max_cnt, min_cnt
      from task_2
    union all
    select role_name , max_cnt, val+1
      from data
     where val+1 <= max_cnt)
select role_name || ' there are ' || val
  from data
 order by role_name, val;

select role_name || ' there are ' || (min_cnt + d.r - 1)
  from task_2 t
       cross join (select rownum r 
                     from dual 
                   connect by level <= (select max(max_cnt - min_cnt + 1) 
                                          from task_2)) d
 where d.r <= max_cnt - min_cnt + 1
 order by role_name, d.r;

with data as (select role_name, min_cnt, max_cnt, max_cnt-min_cnt+1 vals
                from task_2)
select role_name|| ' there are ' || vals
  from data
model
partition by (role_name)
dimension by (0 as i)
measures (vals, min_cnt)
rules (
  vals[for i from 0 to vals[0] increment 1] = min_cnt[0] + cv(i) 
)

select a.role_name||' there are '|| b.n Txt from TASK_2 a,
(select rownum n from dual connect by level <= (select sum(max_cnt) from TASK_2)) b
where b.n >= min_cnt and b.n <= max_cnt
order by a.role_name,b.n;

with TASK_2  as ( 
    select 'SE' as ROLE_NAME , 3 as MIN_CNT   , 5 as MAX_CNT    from dual union
    select 'SSE', 2, 6 from dual union
    select 'MGR', 3, 5 from dual union
    select  'SR_MGR', 1, 4 from dual 
)

select t.ROLE_NAME ||' there are '||l.lv||';' as txt from TASK_2  t left join
(select level as lv from dual connect by level <= (select max(MAX_CNT)  from TASK_2)) l
on l.lv between t.MIN_CNT and t.MAX_CNT
order by txt