关于#mysql#的问题，请各位专家解答！

1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DEFAULT null,
num int check(num>0) not NULL,
primary key(dingdanID,xuhao),
FO' at line 5
请问问题出在哪里？

检查一下是不是哪一个括号符号在中文下写的