INSERT INTO `book_members` (`no`, `userid`, `password`, `username`, `birthyear`, `age`, 
`email`, `phone`, `photo`) VALUES (NULL, 'info', md5('info'), '컴퓨터정보', '1994', '25', 'info@ansan.ac.kr', '+82314006971', NULL);<br />
<b>Fatal error</b>:  Uncaught mysqli_sql_exception: Duplicate entry 'info' for key 'userid' in /users/2018/i1858002/public_html/2022/WebDB/mysql_test.php:7
Stack trace:
#0 /users/2018/i1858002/public_html/2022/WebDB/mysql_test.php(7): mysqli_query()
#1 {main}
  thrown in <b>/users/2018/i1858002/public_html/2022/WebDB/mysql_test.php</b> on line <b>7</b><br />