php - INSERT INTO logins (ID) VALUES ((SELECT COUNT(ID) FROM logins)) Not Working -


i trying insert data table such id field 1 more previous max id. example, if had 21 users registered , 1 added, users' id 21 (note ids start @ 0). tried this: 

mysqli_query($con,"insert logins (id,username)                 values ((select count(id) logins),'$username')");

this error message: #1093 - can't specify target table 'logins' update in clause

i tried works:

$result=mysqli_query($con,"select id logins id=(select max(id) logins)");     while ($db_field = mysqli_fetch_assoc($result))      {         $id=$db_field['id']+1;         mysqli_query($con,"insert logins (id, username)               values ('$id','$username'");         break;     }

but looking way 1 command. in advance.

i suggest make id primary key of table , enable auto_increment. can remove id column query, , increasing id's added automatically.


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