错误代码：1111。无效使用组函数（SQL）

Question

我在MySQL中为牙科练习创建了这个查询

SELECT Paz.Nome, Paz.Cognome FROM Paziente AS Paz, Visita AS Vis WHERE Vis.Paziente=Paz.CF AND MAX(Vis.Parcella)=Vis.Parcella

但不适用于错误1111.请帮帮我

Answer 1

试试这个，我在连接中指定了第二个表，max语句需要采用子查询的形式：

SELECT 
Paz.Nome, 
Paz.Cognome 
FROM Paziente AS Paz
LEFT JOIN Visita AS Vis  ON Vis.Paziente=Paz.CF
WHERE  (SELECT MAX(Parcella) FROM Visita)=Vis.Parcella;