$sql="INSERT INTO 'student'('name','course','grade') VALUES ('jj','value','88')";

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网页提示：< style="color: rgb(0, 0, 0); font-family: "Microsoft YaHei"; white-space: normal;">链接成功添加失败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 ''student'('name','course','grade') VALUES ('jj','value','88')' at line 1