Your MySQL connection id is 1
Server version: 5.5.60 Source distribution 2018-JAN-16

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql 5.5 > use test
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql 5.5 > CREATE TABLE `aliases` (
    ->   `id` int(10) unsigned NOT NULL auto_increment,
    ->   `username` varchar(64) NOT NULL default '',
    ->   `domain` varchar(64) default NULL,
    ->   `contact` varchar(255) NOT NULL default '',
    ->   PRIMARY KEY  (`id`),
    ->   KEY `alias_idx` (`username`,`domain`,`contact`)
    -> ) ENGINE=BLACKHOLE DEFAULT CHARSET=utf8;
ERROR 1071 (42000): Specified key was too long; max key length is 1000 bytes
mysql 5.5 >
---------------------------------------------------------------------------
Your MySQL connection id is 1
Server version: 5.6.40 Source distribution 2018-JAN-16

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql 5.6 > USE test
Database changed
mysql 5.6 > CREATE TABLE `aliases` (
    ->   `id` int(10) unsigned NOT NULL auto_increment,
    ->   `username` varchar(64) NOT NULL default '',
    ->   `domain` varchar(64) default NULL,
    ->   `contact` varchar(255) NOT NULL default '',
    ->   PRIMARY KEY  (`id`),
    ->   KEY `alias_idx` (`username`,`domain`,`contact`)
    -> ) ENGINE=BLACKHOLE DEFAULT CHARSET=utf8;
ERROR 1071 (42000): Specified key was too long; max key length is 1000 bytes
mysql 5.6 >
------------------------------------------------------------------------------
Your MySQL connection id is 2
Server version: 5.7.22 Source distribution 2018-JAN-16

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql 5.7 > USE test
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql 5.7 > CREATE TABLE `aliases` (
    ->   `id` int(10) unsigned NOT NULL auto_increment,
    ->   `username` varchar(64) NOT NULL default '',
    ->   `domain` varchar(64) default NULL,
    ->   `contact` varchar(255) NOT NULL default '',
    ->   PRIMARY KEY  (`id`),
    ->   KEY `alias_idx` (`username`,`domain`,`contact`)
    -> ) ENGINE=BLACKHOLE DEFAULT CHARSET=utf8;
ERROR 1071 (42000): Specified key was too long; max key length is 1000 bytes
mysql 5.7 >
-------------------------------------------------------------------------------------
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 9
Server version: 8.0.5-log Source distribution 2018-JAN-16

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql 8.0 > CREATE DATABASE test;
Query OK, 1 row affected (0.10 sec)

mysql 8.0 > USE test;
Database changed
mysql 8.0 > CREATE TABLE `aliases` (
    ->   `id` int(10) unsigned NOT NULL auto_increment,
    ->   `username` varchar(64) NOT NULL default '',
    ->   `domain` varchar(64) default NULL,
    ->   `contact` varchar(255) NOT NULL default '',
    ->   PRIMARY KEY  (`id`),
    ->   KEY `alias_idx` (`username`,`domain`,`contact`)
    -> ) ENGINE=BLACKHOLE DEFAULT CHARSET=utf8;
ERROR 1071 (42000): Specified key was too long; max key length is 1000 bytes
mysql 8.0 >