DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a <INT_COLUMN> AUTO_INCREMENT, b <CHAR_COLUMN>, PRIMARY KEY (a,b)) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>;
INSERT INTO t1 (b) VALUES ('a'),('b'),('b'),('c'),('a');
SELECT LAST_INSERT_ID();
LAST_INSERT_ID()
1
SELECT a,b FROM t1;
a	b
1	a
2	b
3	b
4	c
5	a
DROP TABLE t1;
CREATE TABLE t1 (a <CHAR_COLUMN>, b <INT_COLUMN> AUTO_INCREMENT, PRIMARY KEY (a,b)) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>;
INSERT INTO t1 (a) VALUES ('a'),('b'),('b'),('c'),('a');
SELECT LAST_INSERT_ID();
LAST_INSERT_ID()
1
SELECT a,b FROM t1;
a	b
a	1
a	2
b	1
b	2
c	1
DROP TABLE t1;
CREATE TABLE t1 (a <CHAR_COLUMN>, b <INT_COLUMN> AUTO_INCREMENT, PRIMARY KEY (a,b), <CUSTOM_INDEX>(b)) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>;
INSERT INTO t1 (a) VALUES ('a'),('b'),('b'),('c'),('a');
SELECT LAST_INSERT_ID();
LAST_INSERT_ID()
1
SELECT a,b FROM t1;
a	b
a	1
a	5
b	2
b	3
c	4
DROP TABLE t1;