如何检查 MySQL 中的列是空的还是空的?

I have a column in a table which might contain null or empty values. How do I check if a column is empty or null in the rows present in a table?

(e.g. null or '' or '  ' or '      ' and ...)

推荐答案

这将选择 some_col 为 NULL 或 '' 的所有行(空字符串)

SELECT * FROM table WHERE some_col IS NULL OR some_col = '';