Mysql-MERGE: Several tables can be merged into one.

by Mohan 2012-09-20 08:22:16

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<h2>
MERGE: Several tables can be merged into one.
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CREATE TABLE log_01 (
pkey int(11) NOT NULL auto_increment,
a int,
b varchar(12),
timeEnter timestamp(14),
PRIMARY KEY (pkey)
) type=MyISAM;

CREATE TABLE log_02 (
pkey int(11) NOT NULL auto_increment,
a int,
b varchar(12),
timeEnter timestamp(14),
PRIMARY KEY (pkey)
) type=MyISAM;

CREATE TABLE log_summary (
pkey int(11) NOT NULL auto_increment,
a int,
b varchar(12),
timeEnter timestamp(14),
PRIMARY KEY (pkey)
) type=MERGE UNION(log_01,log_02) INSERT_METHOD=LAST;

mysql> insert into log_01 (a,b) values (1,'log1');
mysql> insert into log_02 (a,b) values (1,'log2');

mysql> select * from log_summary;
select * from log_summary;
+------+------+------+---------------------+
| pkey | a | b | timeEnter |
+------+------+------+---------------------+
| 1 | 1 | log1 | 2004-04-16 11:59:55 |
| 1 | 1 | log2 | 2004-04-16 12:00:08 |
+------+------+------+---------------------+
2 rows in set (0.00 sec)

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