如何在 sql 服务器查询中同时实现 IsNull 和 Isempty

Question

here I wanted to check if coming value is empty string or null then use value from Db column.Like I did for is null case. How can i check for empty string in this line of code.Please suggest

II.[NAME] = isNull(IIMODEL.[Name], II.[NAME]), 

Answer 1

II.[NAME] = ISNULL(NULLIF(TRIM(IIMODEL.[NAME]), ''), II.[NAME])

Answer 2

Why not just use explicit comparisons?

(II.[NAME] = IIMODEL.[Name] OR IIMODEL.[Name] IS NULL OR IIMODEL.[Name] = '')

I think the logic is much simpler to follow.

Answer 3

case when isnull([column], '') <> '' then [column] else [other] end