如何为特定组合键 (MyISAM) 重置 AUTO_INCREMENT？

Question

I like to set internal AUTO_INCREMENT counter for the table, which uses MyISAM and composite primary key - but just for specific PK combination. If I use

ALTER TABLE tablename AUTO_INCREMENT = 1;

It will set internal counter for all composite PK combinations, which I don't want.

I need something like

ALTER TABLE tablename AUTO_INCREMENT = 1 WHERE prefix = 5 AND suffix = X;

It does not work this way. Is there any possibility to change only counter for specific PK combination in MyISAM table?

Table:

CREATE TABLE `ENG__faktury_counter` 
(
    `year` int(10) NOT NULL,
    `prefix` varchar(10) NOT NULL,
    `DIC` varchar(50) NOT NULL,
    `id_counter` int(15) NOT NULL AUTO_INCREMENT ,
    `created` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
     PRIMARY KEY (`year`,`prefix`,`DIC`,`id_counter`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 

Answer 1

There is virtually zero use for ALTER TABLE ... AUTO_INCREMENT=... .

If you are using MyISAM and have

foo ...
id ... AUTO_INCREMENT
PRIMARY KEY(foo, id)  -- where the _2nd_ column is auto-inc

Then there is nothing to do to get

foo  id
---  --
cat   1
cat   2
dog   1
bird  1
cat   3
bird  2
bird  3
dog   2

regardless of the order in which you insert the rows.

If this does not address your question, please enhance it with an example and SHOW CREATE TABLE .