sql - 仅返回数据

Question

我想知道是否有办法编写常规Select * from...查询但只返回包含数据的字段，因为在任何完全为 NULL 的列中都不会返回？我在想临时表可能是可行的，但我不确定，快速谷歌没有产生任何结果。

原因是我正在查询一个包含数百列的表，其中 95% 是 NULL，那些有数据的表是我需要查看的。

Answer 1

It's not possible by default (as far as i know). You can however write simple function which will unset NULL-valued keys from passed array. But i can't see point of it - please give us more informations about Your problem.

Answer 2

You can create a view with the required column and then use select * from view_name.

Create view V_sample
AS
select column1, column2 
from table

Then you can do:

select * from V_sample