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Can't seem to GROUP BY and ORDER BY in sql query

I'm have a sql query to an oracle database that I can either ORDER BY or GROUP BY without issue but if I try to do both I get this error: "ORA-00979: not a GROUP BY expression"

SELECT * FROM T_TEST WHERE (ISSUEDETAIL = 'DATA1' OR ISSUEDETAIL = 'DATA2' OR ISSUEDETAIL = 'DATA3') GROUP BY TAG ORDER BY TAG, LOCATION
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KingMooBot
Asked:
KingMooBot
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1 Solution
 
jerrypdCommented:
you need to list all the fields in T_test in the group by clause...
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awking00Commented:
I suspect you can have more than one location per tag, which means you somehow have to aggregate the location (e.g. max or min, etc.) in order to group by. Perhaps you can provide some sample data and your expected output to give us a better idea of your requirements.
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markterryCommented:
When you group by, you need to list the fields that are in the group by in the select statement. You can also list other fields that you want to aggregate with sum(), Count(), Avg() functions (And other aggregate functions).
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HainKurtSr. System AnalystCommented:
some valid samples:

numbers in order by shows the order of columns...
SELECT TAG, LOCATION
    FROM T_TEST
   WHERE ISSUEDETAIL IN ('DATA1', 'DATA2', 'DATA3')
GROUP BY TAG, LOCATION
ORDER BY TAG, LOCATION

  SELECT TAG, LOCATION, Count(1) TAG_LOCATION_COUNT
    FROM T_TEST
   WHERE ISSUEDETAIL IN ('DATA1', 'DATA2', 'DATA3')
GROUP BY TAG, LOCATION
ORDER BY 1,2,3 desc

  SELECT TAG, Count(1) TAGCOUNT
    FROM T_TEST
   WHERE ISSUEDETAIL IN ('DATA1', 'DATA2', 'DATA3')
GROUP BY TAG
ORDER BY TAG

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KingMooBotAuthor Commented:
why would I want to list all columns in the GROUP BY if I only want to group by one column?

enclosed is sample data with 2 results (either result is fine)
 data.xlsx
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HainKurtSr. System AnalystCommented:
you should understand what group by is doing first...
your sample data is confusing... why you removed line 3,5,7? where is the grouping here?

maybe you confuse group by & order by...

have a look at this page: http://www.w3schools.com/sql/sql_groupby.asp
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awking00Commented:
You had to apply some criteria to get those results. What differentiates the selection of a given location or uid for the same tag?
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KingMooBotAuthor Commented:
I usually have 2 identical tags (one from each location). I just want the results to show my unique tags, regardless of how many of each identical tag I have.
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jerrypdCommented:
that would be a
select distinct tag from t_test
or
select distinct tag, location from t_test
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awking00Commented:
You show this in your results -
-781709043      4004-10      USA      1      NA543      TEST0      DATA1
-478148541      4006-11      USA      1      NA543      TEST0      DATA1
-478148540      4006-12      USA      2      NA543      TESTX0      DATA1
But this also provides unique tag values -
B8B04AD9291D46F4B  4004-10  CAN      2      VA5      TEST0      DATA1
6ABAB6B13C7918AB6  4006-11  CAN      3      VA5      TESTX0      DATA1
BB00DDFABC27046B2  4006-12  CAN      1      VA5      TESTX0      DATA1
So, the question remains what is the criteria for selecting which record?
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KingMooBotAuthor Commented:
thanks. "DISTINCT" is what I was after. Even after reading up on "GROUP BY" again it still sounds like it does the same thing as "distinct"...
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KingMooBotAuthor Commented:
Awking: either result would be fine. Just looking for unique tags, regardless of which Location they're from.
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awking00Commented:
I guess the group by and order by part of the question threw me off :-)
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