MySQL-如何使用SUM（）并排除SUM（）为0的结果 ---

我想显示SUM（）的结果，其中结果不是0（零）

MySQL Table Name:

• memberlist

Columns:

• m_username
• 2021_03_24
• 2021_03_17
• 2021_03_10
• 2021_03_03
• 2021_02_24
• 2021_02_17

MySQL Query:

SELECT *, SUM( IFNULL(2021_03_24, 0) + IFNULL(2021_03_17, 0) + IFNULL(2021_03_10, 0) + IFNULL(2021_03_03, 0) + IFNULL(2021_02_24, 0) + IFNULL(2021_02_17, 0) ) AS TOTAL_CONTRIBUTION FROM memberlist GROUP BY m_username ORDER BY TOTAL_CONTRIBUTION DESC`

以上MYSQL查询有问题：

It shows results where `TOTAL_CONTRIBUTION` = 0

如何修改MySQL查询，使结果排除TOTAL_CONTRIBUTION=0的任何数据？

HAVING子句

SELECT *, 
SUM( 
   IFNULL(2021_03_24, 0) 
 + IFNULL(2021_03_17, 0) 
 + IFNULL(2021_03_10, 0) 
 + IFNULL(2021_03_03, 0) 
 + IFNULL(2021_02_24, 0) 
 + IFNULL(2021_02_17, 0) 
 ) AS TOTAL_CONTRIBUTION
FROM memberlist
GROUP BY m_username 
HAVING TOTAL_CONTRIBUTION!=0  
ORDER BY TOTAL_CONTRIBUTION 
DESC;