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Can't open file

Posted on 2002-03-28
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Last Modified: 2008-03-03
creating a merged table with the following command within the events database.  The m2001_11 and m2001_12 tables are within the events table as well.

create table mergedArchiveTable (nsid varchar(10), utime int(10), eam_id bigint(20)) type=merge union=(m2001_12, m2001_11);

select * from mergedArchiveTable;

ERROR 1016: Can't open file: 'mergedArchiveTable.MRG'. (errno: 143)

Why is this occuring?
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Question by:jerrykovach
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Expert Comment

by:andriv
ID: 6904961
Are you switching over to the database first:

\u events

Then the query

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Author Comment

by:jerrykovach
ID: 6905542
database was switched over first.  
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andriv earned 800 total points
ID: 6905571
I never had to do a merge but in the manual it uses INSERT_METHOD=LAST, and it says if you don't specify it the inserts will return an error. (Hope it helps):

When you create a MERGE table you have to specify with UNION(list-of-tables) which tables you want to use as one. Optionally you can specify with INSERT_METHOD if you want insert for the MERGE table to happen in the first or last table in the UNION list. If you don't specify INSERT_METHOD or specify NO, then all INSERT commands on the MERGE table will return an error.

The following example shows you how to use MERGE tables:

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

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Expert Comment

by:Moondancer
ID: 6912966
Has this helped you, or is more needed?
Moondancer - EE Moderator
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Author Comment

by:jerrykovach
ID: 6913968
I was able to solve this one on my own.  It seems that the merged tables have to have identical primary and key fields.  I had made a mistake in declaring one of those fields.  I shall give moon dancer credit since he had the closest answer.

Thanks guys.
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