如果特定字段不为空，则mysql将值设置为空

Question

我创建了这个sql select查询：

SELECT subscription_new_projects.banners, subscription_new_projects.banner_link
FROM subscription_new_projects
WHERE be_famous_id =32
AND now( ) < end_date
ORDER BY subscription_new_projects_id DESC

获取此sql结果：

现在我想将banners字段设为空，如果banner_link不为空。

我想要这个结果：

我的SQL小提琴：Example

任何想法如何做到这一点？

感谢。

Answer 1

您可以使用 @Override protected void onActivityResult(int requestCode, int responseCode, Intent intent) { example.onActivityResult(requestCode, responseCode, intent); }

case-when

Answer 2

使用CASE声明。

<强>查询

SELECT 
CASE WHEN subscription_new_projects.banner_link != ''
THEN NULL 
ELSE subscription_new_projects.banners
END AS banners,
subscription_new_projects.banner_link
FROM subscription_new_projects
WHERE be_famous_id =32
AND now( ) < end_date
ORDER BY subscription_new_projects_id DESC;

Fiddle demo