Mysql 将存储过程上载到数据库时出错

什么原因会导致不允许我将存储过程上载到数据库中的错误

错误1064:您的SQL语法有错误

应该是这样的：

IF (SELECT AVG(g.grade)
FROM grades AS g 
JOIN subj AS s ON g.subj_id=s.id
JOIN the_users AS t ON g.user_id=t.id
WHERE t.name = diak) > 5 THEN

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你在混合你的连接语法；'从grades AS g JOIN subj AS s开始，_用户作为t'正确地加入_用户（如果您想这样做，请交叉加入），并查看这是否解决了您的问题。否则，在SSMS中弹出查询并查看您得到的错误。

IF (SELECT AVG(g.grade)
FROM grades AS g JOIN subj AS s, the_users AS t
WHERE
t.id = g.user_id AND s.id = g.subj_id AND t.name = diak) > 5 THEN

IF (SELECT AVG(g.grade)
FROM grades AS g 
JOIN subj AS s ON g.subj_id=s.id
JOIN the_users AS t ON g.user_id=t.id
WHERE t.name = diak) > 5 THEN