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How to I fix query to get rid of error ORA-00923: FROM keyword not found where expected

Posted on 2011-09-23
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Last Modified: 2012-05-12
when I execute the following query:

Select count to_char(publication_date, 'DD-MON-YYYY') as count, publication_date from bib_holdings group by publication_date order by publication_date;

                    *
ERROR at line 1:
ORA-00923: FROM keyword not found where expected


What is wrong with this query?
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Question by:sikyala
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slightwv (䄆 Netminder) earned 250 total points
ID: 36588188
Count is a function

Select count(1), to_char(publication_date, 'DD-MON-YYYY') a from...
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Expert Comment

by:sdstuber
ID: 36588214
there is no need to convert the date if you're going to count it, just count the date as is

Select count(publication_date) as count, publication_date from bib_holdings group by publication_date order by publication_date;

or

Select count(*) as count, publication_date from bib_holdings group by publication_date order by publication_date;

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Expert Comment

by:sdstuber
ID: 36588223
note  count(*) and count(1) are equivalent,  count(*) is recommended practice by oracle

internally it will rewrite it as count(*) anyway


the difference between count(*) and count(publication_date)  is the handling of NULL values.

count(*) will count rows, regardless of whether they have nulls or not

count(publication_date) will count NOT-NULL values only

count(to_char(publication_date,'DD-MON-YYYY'))  will also count NOT_NULL values only, so the extra conversion isn't necessary
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by:slightwv (䄆 Netminder)
ID: 36588277
I assumed they wanted to count the days not the time portion which is why I moved the to_char outside the count.
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Assisted Solution

by:sdstuber
sdstuber earned 250 total points
ID: 36588327
ah, that changes the group by then too
and makes the order by tricky since the the dates will be strings

Select count(*) as count, to_char(publication_date,'dd-MON-yyyy') publication_date from bib_holdings group by to_char(publication_date,'dd-MON-yyyy')
order by to_char(publication_date,'dd-MON-yyyy')   -- this probably the wrong order by

alternately  use trunc to count by day

Select count(*) as count, trunc(publication_date) publication_date
from bib_holdings
group by trunc(publication_date)
order by trunc(publication_date)
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Author Closing Comment

by:sikyala
ID: 36588352
Thanks it worked
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