DROP TABLE IF EXISTS t1, t2, t3;
CREATE TABLE t1 (a INT, b CHAR(8), PRIMARY KEY (a)) ENGINE=xengine;
INSERT INTO t1 (a,b) VALUES (100,'foo'),(2, 'b');
CREATE TABLE t2 (a INT, b CHAR(8), PRIMARY KEY (b)) ENGINE=xengine CHARACTER SET utf8;
Warnings:
Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
INSERT INTO t2 (a,b) VALUES (1, 'bar');
CREATE TABLE t3 (a INT, b CHAR(8), pk INT AUTO_INCREMENT PRIMARY KEY) ENGINE=xengine CHARACTER SET utf8;
Warnings:
Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
DESCRIBE t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	NO	PRI	NULL	
b	char(8)	YES		NULL	
DESC t2 a;
Field	Type	Null	Key	Default	Extra
a	int(11)	YES		NULL	
DESCRIBE t3 '%';
Field	Type	Null	Key	Default	Extra
a	int(11)	YES		NULL	
b	char(8)	YES		NULL	
pk	int(11)	NO	PRI	NULL	auto_increment
DROP TABLE t1, t2, t3;