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MERGE

The MERGE storage engine, also known as the MRG_MyISAM engine, is a collection of identical MyISAM tables that can be used as one. “Identical” means that all tables have identical column and index information. 


CREATE TABLE t1 (
   a INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
   message CHAR(20)) ENGINE=MyISAM;
CREATE TABLE t2 (
   a INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
   message CHAR(20)) ENGINE=MyISAM;
INSERT INTO t1 (message) VALUES ('Testing'),('table'),('t1');
INSERT INTO t2 (message) VALUES ('Testing'),('table'),('t2');
CREATE TABLE total (
   a INT NOT NULL AUTO_INCREMENT,
   message CHAR(20), INDEX(a))
   ENGINE=MERGE UNION=(t1,t2) INSERT_METHOD=LAST;