Re: Moving data from one set of tables to another?

Somewhat empty, yes. The single set of 'data_' tables contains 3 years
worth of data. I want to move 2 years worth out into the 'new_' tables.
When I'm done, there will still be 1 year's worth of data left in the
original table.

Howard

Carol Walter wrote:
> What do you want for your end product? Are the old tables empty after
> you put the data into the new tables?
>
> Carol
>
> On Sep 18, 2008, at 3:02 PM, Howard Eglowstein wrote:
>
>> I have three tables called 'data_a', 'data_b' and 'data_c' which each
>> have 50 columns. One of the columns in each is 'id' and is used to
>> keep track of which data in data_b and data_c corresponds to a row in
>> data_a. If I want to get all of the data in all 150 fields for this
>> month (for example), I can get it with:
>>
>> select * from (data_a, data_b, data_c) where data_a.id=data_b.id AND
>> data_a.id = data_c.id AND timestamp >= '2008-09-01 00:00:00' and
>> timestamp <= '2008-09-30 23:59:59'
>>
>> What I need to do is execute this search which might return several
>> thousand rows and write the same structure into 'new_a', 'new_b' and
>> 'new_c'. What i'm doing now in a C program is executing the search
>> above. Then I execute:
>>
>> INSERT INTO data_a (timestamp, field1, field2 ...[imagine 50 of
>> them]) VALUES ('2008-09-01 00:00:00', 'ABC', 'DEF', ...);
>> Get the ID that was assigned to this row since 'id' is a serial field
>> and the number is assigned sequentially. Say it comes back as '1'.
>> INSERT INTO data_b (id, field1, field2 ...[imagine 50 of them])
>> VALUES ('1', 'ABC', 'DEF', ...);
>> INSERT INTO data_c (id, field1, field2 ...[imagine 50 of them])
>> VALUES ('1', 'ABC', 'DEF', ...);
>>
>> That moves a copy of the three rows of data form the three tables
>> into the three separate new tables.
>> From the original group of tables, the id for these rows was, let's
>> say, '1234'. Then I execute:
>>
>> DELETE FROM data_a where id='1234';
>> DELETE FROM data_b where id='1234';
>> DELETE FROM data_c where id='1234';
>>
>> That deletes the old data.
>>
>> This works fine and gives me exactly what I wanted, but is there a
>> better way? This is 7 SQL calls and it takes about 3 seconds per
>> moved record on our Linux box.
>>
>> Any thoughts or suggestions would be appreciated.
>>
>> Thanks,
>>
>> Howard
>>
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