MySQL的计数值

我有我的MySQL数据库和下面的数据

我想数一数约翰付了多少钱

ID NAME NUMBER COUNTRY STATUS 
----------------------------------
1  JOHN  021    USA    PAID
2  MIKE  022    CA     UNPAID
3  KENT  023    UK     NOT-OPEN
4  JOHN  021    USA    PAID

我的查询：

SELECT COUNT(*) FROM USER WHERE NUMBER = '021' OR NAME = 'JOHN' HAVING STATUS = 'PAID'

但是我收到了这个错误：

“having子句”中的未知列“STATUS”

---

用

和

此外，为了确保只获得该单个用户的计数，还需要输入

(NUMBER = '021' AND NAME = 'JOHN')

试试这个：

    SELECT COUNT(*) FROM USER WHERE (NUMBER = '021' AND NAME = 'JOHN') AND STATUS = 'PAID'

正在努力取得成果。。结果中没有列状态

或者添加WHERE子句（并避免使用）

或者添加要选择的列（但对于mysql版本>5.6，这需要一个group by to fr默认sql_模式设置）

您也可以这样做：

SELECT COUNT(*) FROM USER WHERE (NUMBER = '021' OR NAME = 'JOHN') AND (STATUS = 'PAID')

在
拥有
SELECT COUNT(*), STATUS  
FROM USER 
WHERE NUMBER = '021' OR NAME = 'JOHN' 
GROUP BY STATUS 

HAVING STATUS = 'PAID'

SELECT COUNT(*) FROM USER WHERE (NUMBER = '021' OR NAME = 'JOHN') AND (STATUS = 'PAID')