I want to reorder a table and then group and average it's values. I
tried something similar to
SELECT AVG(a) FROM (SELECT a FROM table ORDER BY a) group by ROWID/10;
in order to take the average 'a' for groups of 10 succesive values. My
example fails. To understand I tried
SELECT ROWID FROM (SELECT * FROM table ORDER BY a);
and found that ROWID is null, not the record number as I expected. I
cannot modify my example adding ROWID to the nested select, as in
SELECT AVG(a) FROM (SELECT ROWID, a FROM table ORDER BY a) group by ROWID/10;
as the ROWIDs would be in disorder.
Thus my question, what is the correct way of solving my problem?
Best regards,
Luis
--
o
W. Luis Mochán, | tel:(52)(777)329-1734 /<(*)
Instituto de Ciencias Físicas, UNAM | fax:(52)(777)317-5388 `>/ /\
Apdo. Postal 48-3, 62251 | (*)/\/ \
Cuernavaca, Morelos, México | moc...@fis.unam.mx /\_/\__/
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