尝试使用递归后,我有疑问
我正在尝试使用两张桌子
第一个表complain_table
complain product_id
----------------------------------------
Not working - 1
not working 1
not working 1
Loading problem 2
Loading problem 2
第二个表product_table
Name id
--------------
usb 1
cd 2
现在我想要的输出是
product complain
-----------------------------------
usb Not working
Not working
Not working
cd Loading problem
Loading problem
如果您希望按
所示输出(禁止显示重复的产品名称),则应执行以下操作:
select case
when row_number() over (partition by p.name order by ct.complain) = 1 then p.name
else null
end as product,
ct.complain
from products p
join complain_table ct on p.product_id = ct.product_id
order by p.product_id;
顺便说一句:您的complain_table
看起来应该有一个引用complain_reason_text
表的complain_reason_id
,以避免一遍又一遍地重复相同的投诉文本