max function in R not giving desired Date results

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max function in R not giving desired Date results



I am trying to use Max function to get the record with latest dates but it does not give desired results as it also gives data with old dates.Below is output of dataframe OA_Output:


Org_ID ORG_OFFICIAL_NORM_NAME ORG_IMMEDIATE_PARENT_SRC ORG_IP_SRC_MD_Date
-------- ---------------------- ------------------------ ------------------
132693 BOLLE INCORPORATED abc.com 26-JUN-18
122789 BEE STINGER, LLC aa.com 12-Mar-18
344567 CALIBER COMPANY xyz.com 16-Feb-16
639876 Maruti yy.com 23-Jun-17



I am running below R Code to get the records with latest dates:


gautam1 <-

sqldf(

"
SELECT ORG_OFFICIAL_NORM_NAME,ORG_IMMEDIATE_PARENT_SRC
,MAX(ORG_IP_SRC_MD_DATE),ROW_ID
FROM OA_output
where ROW_ID = 1
and ORG_IMMEDIATE_PARENT_SRC like '%exhibit21%'
GROUP BY ORG_IMMEDIATE_PARENT_ORGID
ORDER BY ORG_IMMEDIATE_PARENT_ORGID

" )



In The above code max function is not giving desired results.I am not sure whether there is a date format issue between Oracle and R.
Any help will be appreciated
Thanks
Gautam





Does your Date column has correct type? You can use class()?
– franiis
Aug 6 at 10:52



Date


class()





yes it is of Date type. how should i use Class (). can you help me
– Gautam Biswas
Aug 6 at 11:01






this is an SQL question rather than an R question. The max function is used in SQL only.
– Cettt
Aug 6 at 11:24






Please make your input dataframe OA_output reproducible.
– zx8754
Aug 6 at 12:02



OA_output





sqldf does not work with Oracle. It works with SQLite, H2, MySQL and PostgreSQL.
– G. Grothendieck
Aug 6 at 12:06




1 Answer
1



can you please use below query as a sql and run again code


SELECT ORG_OFFICIAL_NORM_NAME,ORG_IMMEDIATE_PARENT_SRC
,MAX(ORG_IP_SRC_MD_DATE),ROW_ID
FROM OA_output
where ROW_ID = 1
and ORG_IMMEDIATE_PARENT_SRC like '%exhibit21%'
GROUP BY ORG_OFFICIAL_NORM_NAME,ORG_IMMEDIATE_PARENT_SRC,ROW_ID
ORDER BY ORG_IMMEDIATE_PARENT_ORGID





I need to run the above query in R to get the records with latest dates
– Gautam Biswas
Aug 7 at 7:17





@GautamBiswas does this query return your expected result in db editor? if it is return your expected result in db editor then definitely it will return in R, so my idea 1st run this sql code in db then check is that correct or not? then move new strategy
– Zaynul Abadin Tuhin
Aug 7 at 7:23







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