我正在多次插入to..select语句,如下所示。如果你看到,在所有三个语句中只有一个列值( Req_Attrname )正在发生变化。其他所有内容都相同,包括where
条件。
插入声明1)
insert into details(repo_phyid,repo_type,repo_attrname,repo_Attrvalue
,Req_phyid,Req_type,Req_Attrname,Req_attrvalue)
select demo.phyid,'Complementary Item','Product Management Responsible',demo.attr_value,
tnr.phyid,'Complementary Item','**Product Manager**',demo.attr_value
From repo_Tnr Tnr,repo_Tnr_Attribute demo
Where Tnr.Phyid=demo.Phyid
And demo.Attr_Name='Product Management Responsible'
and tnr.type='Complementary Item'
插入声明2)
insert into details(repo_phyid,repo_type,repo_attrname,repo_Attrvalue,
Req_phyid,Req_type,Req_Attrname,Req_attrvalue)
select demo.phyid,'Complementary Item','Product Management Responsible',demo.attr_value,
tnr.phyid,'Complementary Item','**Quality Manager**',demo.attr_value
From repo_Tnr Tnr,repo_Tnr_Attribute demo
Where Tnr.Phyid=demo.Phyid
And demo.Attr_Name='Product Management Responsible'
and tnr.type='Complementary Item'
插入声明3)
insert into details(repo_phyid,repo_type,repo_attrname,repo_Attrvalue
,Req_phyid,Req_type,Req_Attrname,Req_attrvalue)
select demo.phyid,'Complementary Item','Product Management Responsible',demo.attr_value
,tnr.phyid,'Complementary Item',**'Depty Engineer**',demo.attr_value
From repo_Tnr Tnr,repo_Tnr_Attribute demo
Where Tnr.Phyid=demo.Phyid
And demo.Attr_Name='Product Management Responsible'
and tnr.type='Complementary Item'
我在这里尝试的是,如果select返回20行,首先我必须插入带有Product Manager
的20行作为Req_attrname的值,然后我必须插入相同的20行但是{{1并且再次使用Quality Manager
。为了完成这个我使用3插入语句。像这样我有15到20个插入语句。有没有办法可以在单个插入语句中执行此操作?它将帮助我减少代码并提高可读性。请提供替代解决方案。
答案 0 :(得分:2)
由于Req_Attrname
都是常量,因此您可以在dual
和cross join
查询原始查询中的所有结果,以便从查询中获取每一行与每个{ {1}}:
Req_Attrname