MYSQL计算非空行

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

虽然您希望有条件地计算，但您的查询没有任何WHERE部分

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

Answer 2

尝试这样：根据要求添加where子句。

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