INSERT INTO `book_members` (`no`, `userid`, `username`, `birthyear`, `age`, `password`, `phone`, `photo`, `email`) VALUES (NULL, 'info', '컴퓨터정보', '1994', '25', md5('info'), '+820314006971', NULL, 'info@ansan.ac.kr');<br />
<b>Fatal error</b>:  Uncaught mysqli_sql_exception: Duplicate entry 'info' for key 'userid' in /users/2019/i1919032/public_html/2022/WebDB/mysql_test.php:9
Stack trace:
#0 /users/2019/i1919032/public_html/2022/WebDB/mysql_test.php(9): mysqli_query()
#1 {main}
  thrown in <b>/users/2019/i1919032/public_html/2022/WebDB/mysql_test.php</b> on line <b>9</b><br />