每行中非空列的计数 [英] Count of non-null columns in each row
本文介绍了每行中非空列的计数的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个包含4列的表,在第5列中,我想存储前4列中有多少个非null列的计数.例如:
I have a table that contains 4 columns and in the 5th column I want to store the count of how many non-null columns there are out of the previous 4. For example:
其中X为任意值:
Where X is any value:
Column1 | Column2 | Column3 | Column4 | Count
X | X | NULL | X | 3
NULL | NULL | X | X | 2
NULL | NULL | NULL | NULL | 0
推荐答案
select
T.Column1,
T.Column2,
T.Column3,
T.Column4,
(
select count(*)
from (values (T.Column1), (T.Column2), (T.Column3), (T.Column4)) as v(col)
where v.col is not null
) as Column5
from Table1 as T
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