MYSQL计数非空的行

Question

我只需要计算那些非空的行。谢谢。

SELECT component,count(comp_details) FROM table GROUP BY component 

Answer 1

请按如下所示尝试：根据需求添加where子句。

SELECT component,count(comp_details) FROM table where comp_details is not null and comp_details != "" GROUP BY component 

Answer 2

虽然要有条件地又算你的查询没有任何WHERE部分

SELECT component,count(comp_details) 
FROM table 
WHERE IFNULL(component, '') != '' 
GROUP BY component