SELECT COALESCE(SUM(money),0.00)
FROM user_zhangmu
WHERE phone= '15610077197' AND title = '-1'
使用COALESCE(a,b),当a的值等于NULL时,便会直接替换成b。
SELECT COALESCE(SUM(money),0.00)
FROM user_zhangmu
WHERE phone= '15610077197' AND title = '-1'
使用COALESCE(a,b),当a的值等于NULL时,便会直接替换成b。