MAX keep dense function
Hi Everyone,
Rod West explained to me about MAX keep dense here:
function: row_number
I have another query to do that could use MAX, so tried this:
MAX(Status) KEEP(DENSE_RANK LAST ORDER BY ID||Status )
I want the max status for a student (where a student can have mutiple records with multiple status values)
I am getting an error:
ora 001722 - invalid number.
the status is an alpha field....
Did i code the max function correctly?
pls advise, thx, sandra
Hi,
This is not a problem with the MAX function, it is a conversion problem somewhere in the SQL that is sent the data or in an underlying database. When the database scans the table data there was some text that could not be converted into a number. If you have a condition comparing two types, e.g. number_column = text_column then Oracle will convert this condition to number_column = TO_NUMBER(text_column) and will attempt to convert all the text_columns when the table is scanned even if the rows are not need to resolve the query.
Without any more information about the query or the datatypes I cannot say how you might resolve this. There is more discussion in these threads:
Re: Invalid Number Error in Disco Plus - Urgent please!!
Re: ORA-01722: invalid number.
Rod West
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Tables *
tables:
sflight, " Flight master
sbook. " Single flight booking
Field string to hold flight master data *
data:
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carrid type sflight-carrid, " Carrier Id
connid type sflight-connid, " Connection Id
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data:
t_sflight like
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data:
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at pf13.
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at pf14.
if sy-curow le 3.
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Hi Everyone,
Am aware of the following flavors of MAX function
1) choose MAX from the folders/fields list (selected items tab)
2) create calculation using: MAX keep dense
3) create calculation using: MAX analytic function
questions, pls:
===========
a) with MAX regular, MAX keep dense, MAX - analytic function
is it necessary to sort it using tools/sort - choose fields to sort by?
or does the data get sorted due to the ORDER BY clause in MAX used in a calculation
b) how to understand the diff. bet. MAX keep dense and MAX - analytic function
1) i understand that analytic functions are applied after detail row processing
does MAX keep dense calculation happen during detail row processing?
2) how did you know to advise when to use MAX keep dense, and when to use MAX - analytic function?
tx for your ideas and assistance, sandraHi,
a) with MAX regular, MAX keep dense, MAX - analytic function is it necessary to sort it using tools/sort - choose fields to sort by? or does the data get sorted due to the ORDER BY clause in MAX used in a calculationIt is only necessary to use a sort if you want to have the rows returned in a specific order. The order by in the max calculation defines the maximum within the group or window. It may affect the order the rows are returned, but if it does this is not guaranteed and you should use a sort on the main query.
b) how to understand the diff. bet. MAX keep dense and MAX - analytic function
1) i understand that analytic functions are applied after detail row processing does MAX keep dense calculation happen during detail row processing?Yes
2) how did you know to advise when to use MAX keep dense, and when to use MAX - analytic function?In general, if you want the result on a single row, so you have one row for each group then you should use the aggregate max. If you want to use the same max on all the rows in the window (defined by the partition) then use the analytic max.
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Check this link :
http://help.sap.com/saphelp_nw04/helpdata/en/6f/56853c08c7aa11e10000000a11405a/content.htm
http://help.sap.com/saphelp_nw04/helpdata/EN/13/e072abaddb574284d22361f0b824bf/content.htm
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/72f4a790-0201-0010-5b89-a42a32223ffc
It may help you......
Regards,
Debjani......
Edited by: Debjani Mukherjee on Sep 28, 2008 6:17 AM
Edited by: Debjani Mukherjee on Sep 28, 2008 6:23 AM
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