【发布时间】:2017-12-27 18:18:55
【问题描述】:
我在 MySQL 中为牙科诊所创建了这个查询
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。请帮助我
【问题讨论】:
标签: mysql sql mysql-error-1111
我在 MySQL 中为牙科诊所创建了这个查询
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。请帮助我
【问题讨论】:
标签: mysql sql mysql-error-1111
试试这个,我在join中指定了第二张表,max语句需要是子查询的形式:
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;
【讨论】: