SELECT COALESCE(SUM(money),0.00)
FROM user_zhangmu
WHERE phone= '15610077197' AND title = '-1'
使用COALESCE(a,b),當a的值等於NULL時,便會直接替換成b。
SELECT COALESCE(SUM(money),0.00)
FROM user_zhangmu
WHERE phone= '15610077197' AND title = '-1'
使用COALESCE(a,b),當a的值等於NULL時,便會直接替換成b。