来自datetime字段的布尔值

Question

我需要一个布尔值（is_published），它指示日期时间字段published是否已设置或为空。

工作示例：

SELECT published, published IS NOT NULL as is_published  FROM `table`

Answer 1

SELECT (CASE publishedDateTime IS NULL THEN 0 ELSE 1 END CASE) AS is_published