To find average
hi,
columns
year_month_no
200901,200902 etc
quantity,
10,30,50 etc
part
AB,BC,ZD etc
Average for last 12 months excluding current month
for finding average for previous 12 months of quantity iam using
AVG(quantity) OVER (ORDER BY year_month_no
ROWS BETWEEN 12 PRECEDING AND 1 PRECEDING) AVG_QTY_SALES
but year_month_no is repeating in the table
like
200901 10 AB
200901 20 BC etc
so when i am using rows between 12 preceding 1 it is fetching data for the same year_month_no because it is repeating instead of rolling up to previous 12 months..is there any solution for this..please help me as i am a naive user to oracle
thanks in advance
aswin
Hi, Aswin,
It sounds like you need a PARTITION BY clause:
AVG (quantity) OVER (
PARTITION BY part -- ***** ADD THIS *****
ORDER BY year_month_no
ROWS BETWEEN 12 PRECEDING
AND 1 PRECEDING
) AS ave_qty_sales"PARTITION BY part" menas that the function will be computed separately for each part. For example, owhen calculating the average for a row where part='AB', only the 12 preceding rows that also have part='AB' will be considered.
Is year_month_no a NUMBER? That's a bad idea. Columns that represent points in time should be DATEs.
You're using ROWS BETWEEN. so if there are two (or more) rows with the same part and year_month_no, then the preceding 12 ROWS might represent less that 12 months. On the other hand, if there are no rows for a given part in some months, the the ROWS could be more that 12 months. You might want RANGE BETWEEN instead of ROWS BETWEEN.
Whenever you have a question, please post a little sample data (CREATE TABLE and INSERT statements) for all the tables involved, so the people who want to help you can re-create the problem and test their ideas. Also post the results you want from that data, and an explanation of how you get those results from that data.
In the case of a DML operation (such as INSERT) the sample data should show what the tables are like before the DML, and the results will be the contents of the changed table(s) after the DML.
Explain, using specific examples, how you get those results from that data.
lways say what version of Oracle you're using (e.g. 11.2.0.2.0).
See the forum FAQ {message:id=9360002}
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