Bagaimana memilih dari nama tabel dinamis

Anda membuka 1 ( dan tutup 2 ) . Hapus yang terakhir:

SELECT CONCAT('changes',year,month) FROM changes

Sunting

pernyataan kedua mungkin seharusnya

SET @x := SELECT * FROM (@b) as b;

Itu berhasil, tetapi tidak yakin apakah itu yang Anda inginkan:

SET @b := 'SELECT CONCAT(''changes'',`year`,`month`) FROM whichchanges';
SET @x := 'SELECT * FROM (SELECT CONCAT(''changes'',`year`,`month`) FROM whichchanges) as b';
Prepare stmt FROM @b;
Prepare stmt FROM @x;
Execute stmt;

Edit2

Jika saya memahami Anda dengan benar, Anda mencari satu pertanyaan itu:

select * from changes
where change_column in (select distinct concat(`year`, `month`) from whichchanges)

Edit3

select @b := group_concat(concat(' select * from changes', `year`, `month`, ' union ') separator ' ') as w from whichchanges;
set @b := left(@b, length(@b) - 6);

Prepare stmt FROM @b;
Execute stmt;

Contoh SQLFiddle