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Replicating values in a table

I have a table that contains mostly zero entries but has a few
non-zero values scattered randomly in the table as VERSION 1 below.
What I want to do is fill in the zeroed values with copies of the
non-zero values resulting in the modified version of the table as
shown in VERSION 2 below.

In other words, I want to replicate entries following the entries as
originally supplied.

I would like someone to supply me with the MySQL code that can do this
or point me at an example of it.

CREATE TABLE `table1` (
`record_number` int(8) NOT NULL auto_increment,
`field_A` int(11) default NULL,
PRIMARY KEY (`record_number `),
UNIQUE KEY `record_number` (`record_number `)
) TYPE=MyISAM

VERSION 1
1 0
2 0
3 0
4 99
5 0
6 0
7 0
8 0
9 33
10 0
11 0
12 0

VERSION 2
1 0
2 0
3 0
4 99
5 99
6 99
7 99
8 99
9 33
10 33
11 33
12 33

Thanks very much for your help.
Jul 20 '05 #1
1 1483
James E Koehler wrote:
I have a table that contains mostly zero entries but has a few
non-zero values scattered randomly in the table as VERSION 1 below.
What I want to do is fill in the zeroed values with copies of the
non-zero values resulting in the modified version of the table as
shown in VERSION 2 below.


How about pseudocode:

query:
SELECT record_number, field_A
FROM table1
WHERE field_A != 0
ORDER BY record_number DESC

Loop over result set of above query:
{
execute:
UPDATE table1 SET field_A = ?
WHERE field_A = 0 AND record_number > ?
}

Provide the values from the current record in the loop as parameters to
the UPDATE.

You may have been hoping for a complex update statement that would do
the whole thing, but I can't think of one. Sometimes it's better to
make use of a programming language to help you out.

Regards,
Bill K.
Jul 20 '05 #2

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