如何制作动态pl / sql？

Question

我想在参数值中使用类型变量来创建动态pl / sql。

参数值>类型= {'名称+位置'，'resno'，'hpno'，'telno'}；

例如，如果我得到了参数值（'resno'，'hpno'），则需要两个组合查询（全部2个并集），因此，这意味着查询数量取决于参数值。

select * from (
--repeatation
select * from
(select a.custnm
     , 'name + place' as vtype
     , a.custnm || '-' || c.pjtcd || '-' || c.dong || '-' || c.ho as con
     , count(a.custid) as nodup 
from   custtable a
     , thng c 
where a.custid = c.custid(+)
group by a.custnm, c.pjtcd, c.dong, c.ho
having count(a.custid) > 1) x
--/repeatation
union all
--repeatation
select * from
(select a.custnm
     , 'resno' as vtype
     , a.resno as condup
     , count(a.custid) as nodup 
from   custtable a
group by a.custnm, a.resno
having count(a.custid) > 1) x2
--repeatation
union all
--repeatation
select * from
(select a.custnm
     , 'hpno' as vtype
     , a.hpno as condup
     , count(a.custid) as nodup 
from   custtable a
group by a.custnm, a.hpno
having count(a.custid) > 1) x3
--repeatation
union all
--repeatation
select * from
(select a.custnm
     , 'telno' as vtype
     , a.telno as condup
     , count(a.custid) as nodup 
from   custtable a
group by a.custnm, a.telno
having count(a.custid) > 1) x4
--repeatation
) 
order by decode(vtype, 'name +`enter code here` place', 1 ,'resno', 2 ,'hpno', 3,  'telno', 4), nodup desc

请让我知道如何用参数值制作plsql

Answer 1

这是一个SELECT语句。 现在的编写方式是SQL，而不是PL / SQL，我的建议是这样 。 与其编写可怕的PL / SQL（动态SQL通常不是很好），不如不基于该语句创建视图 ？

create or replace view v_my_view as
select * from (
--repeatation
select * from
(select a.custnm
     , 'name + place' as vtype
<snip>

完成后，可在任何需要的地方使用它（包括PL / SQL）。