Question

我一直在运行以下查询而没有问题：

with Nums (NN) as
(
select 0 as NN
from dual
union all
select NN+1 -- (1)
from Nums
where NN < 30
)

select null as errormsg, trunc(sysdate)-NN as the_date, count(id) as the_count
from Nums
left join
(
    SELECT c1.id,  trunc(c1.c_date)   as c_date
    FROM table1 c1
    where c1.c_date > trunc(sysdate) - 30
    UNION
    SELECT c2.id, trunc(c2.c_date)
    FROM table2 c2
    where c2.c_date > trunc(sysdate) -30
) x1
on x1.c_date =  trunc(sysdate)-Nums.NN
group by trunc(sysdate)-Nums.NN

但是，当我尝试在使用SSRS的proc中弹出它时：

procedure pr_do_the_thing (RefCur out sys_refcursor)

is 
  oops  varchar2(100);
begin

open RefCur for
-- see above query --
;
end pr_do_the_thing;

我得到了

错误（）：PL / SQL：ORA-00932：不一致的数据类型：预期有NUMBER -

有什么想法？就像我上面所说，作为一个查询，没有问题。作为proc，错误出现在注释（1）int eh query。

Answer 1

这似乎是错误18139621（参见MOS Doc ID 2003626.1）。有一个补丁可用，但如果这是您遇到此问题的唯一地方，则切换到分层查询可能更简单：

with Nums (NN) as
(
    select level - 1
    from dual
    connect by level <= 31
)
...

您还可以计算CTE内的日期（使用递归CTE也会失败）：

with Dates (DD) as
(
    select trunc(sysdate) - level + 1
    from dual
    connect by level <= 31
)
select null as errormsg, DD as the_date, count(id) as the_count
from Dates
left join
(
    SELECT c1.id,  trunc(c1.c_date)   as c_date
    FROM table1 c1
    where c1.c_date > trunc(sysdate) - 30
    UNION
    SELECT c2.id, trunc(c2.c_date)
    FROM table2 c2
    where c2.c_date > trunc(sysdate) -30
) x1
on x1.c_date = DD
group by DD;

我可能会稍微区别一点，因此子查询不会直接限制日期范围：

with dates (dd) as
(
    select trunc(sysdate) - level + 1
    from dual
    connect by level <= 31
) 
select errormsg, the_date, count(id) as the_count
from (
    select null as errormsg, d.dd as the_date, c1.id
    from dates d
    left join table1 c1 on c1.c_date >= d.dd and c1.c_date < d.dd + 1
    union all
    select null as errormsg, d.dd as the_date, c2.id
    from dates d
    left join table2 c2 on c2.c_date >= d.dd and c2.c_date < d.dd + 1
)
group by errormsg, the_date;

但与往常一样，检查每种方法的表现......

另请注意，我已从union切换到union all。如果一个ID可能在同一天，同一个表或两个表中出现多次，那么计数将会有所不同 - 您需要决定是将它们计数一次还是计算它们的次数。这也适用于您的原始查询。

Ora-00932 - 预计有NUMBER个 -

1 个答案: