I am getting "no results returned" for the following query:
SELECT
Referer
FROM
(SELECT
ROW_NUMBER() OVER (ORDER BY CT.Referer ASC) AS RowNum,
CT.Referer, CT.LastModified
FROM
ClickTrack CT
JOIN
OrderTrack OT ON OT.ClickTrackID = CT.ClickTrackID
GROUP BY
CT.Referer, CT.LastModified
HAVING
LEN(CT.Referer) > 0) as num
WHERE
RowNum = 1
AND LastModified BETWEEN '07/06/2013' and '08/05/2013'
Curiously, when I leave off RowNum = 1, I get the full list of values. I need to get one at a time though to assign to a variable and drop into a temporary table.
The end query will be in a while loop using scalar variables in place of the date ranges and RowNum comparison.
Any help is appreciated. Thank you!
I'm thinking RowNum 1 may not have a date between your selections. Maybe put the date selection inside so that you know that the first one matches.
SELECT Referer
FROM (SELECT ROW_NUMBER() OVER (ORDER BY CT.Referer ASC)
AS RowNum, CT.Referer, CT.LastModified
FROM ClickTrack CT
JOIN OrderTrack OT ON OT.ClickTrackID = CT.ClickTrackID
WHERE CT.LastModified BETWEEN '07/06/2013' and '08/05/2013'
GROUP BY CT.Referer, CT.LastModified
HAVING LEN(CT.Referer) > 0) as num
WHERE RowNum = 1
Related
I have this query where a user defined function is added in the select and group by statement.
The inner select query without the WITH clause runs fine and doesn't give any error. But after adding WITH clause it gives the following error -
ORA-00979: not a GROUP BY expression
00979. 00000 - "not a GROUP BY expression"
*Cause:
*Action: Error at Line: 3 Column: 29
I need the WITH clause to return only a subset of the entire result set based on input ranges.
Query is as follows:
WITH INFO AS (
SELECT
GET_EVAULATED_VALUE(T.C_IMP, T.IMP) AS IMPORTANCE,
count(*) AS NO_OF_PC_AFFECTED
FROM TABLE_NAME T
WHERE T.ACNT_REL_ID = 16
GROUP BY
(GET_EVAULATED_VALUE(T.C_IMP, T.IMP))
ORDER BY IMPORTANCE desc
)
SELECT * FROM
(
SELECT ROWNUM AS RN,
(SELECT COUNT(*) FROM INFO) COUNTS,
IMPORTANCE
FROM INFO
)
WHERE RN > 0 AND RN <= 10;
I am not sure how to use CTE with group by on user defined function. But I realized that I can rewrite the query to remove sub-query and CTE and make it simpler as following (and it works):
select * from (
select a.*, ROWNUM rnum from
(SELECT
count(*) over() as COUNTS,
GET_EVAULATED_VALUE(T.C_IMP, T.IMP) AS IMPORTANCE,
count(*) AS NO_OF_PC_AFFECTED
FROM TABLE_NAME T
WHERE T.ACNT_RELATION_ID = 16
GROUP BY
(GET_EVAULATED_VALUE(T.C_IMP, T.IMP))
ORDER BY importance desc) a
where ROWNUM <= 10 )
where rnum >= 0;
Same issue here, I created a table "TABLE_CTE" instead of using a CTE and it worked.
CREATE TABLE TABLE_CTE
AS
SELECT
USER_DEFINED_FUNCTION(date_1),
COUNT(*)
FROM
TABLE_NAME
GROUP BY
USER_DEFINED_FUNCTION(date_1)
;
SELECT * FROM TABLE_CTE
Table 1 has duplicate entries in column A with same frequency values. I need to select one random record out of those .If the duplicate entry contain 'unknown' as a column B value ( like in record "d") select one from other rows . I need a select statement which satisfy the above . Thanks .
These conditions can be prioritized using a case expression in order by with a function like row_number.
select A,B,frequency,timekey
from (select t.*
,row_number() over(partition by A order by cast((B = 'unknown') as int), B) as rnum
from tbl t
) t
where rnum = 1
Here for each group of A rows, we prioritize rows other than B = 'unknown' first, and then in the order of B values.
Use row_number analytic function. If you want to select not unknown record first, then use the query below:
select A, B, Frequency, timekey
from
(select
A, B, Frequency, timekey,
row_number() over(partition by A,Frequency order by case when B='unknown' then 1 else 0 end) rn
)s where rn=1
And if you want to select unknown if they exist, use this row_number in the query above:
row_number() over(partition by A,Frequency order by case when B='unknown' then 0 else 1 end) rn
How can I reset the counter like below examples (I need to generate counter in the column named "Counter I need to generate"?
Looks like each value larger than 1 resets the counter, is that right?
If so, you could assign a group number first, based on the number of times a value > 1 occurs before the current row (including). So row 1 to 11 will be group 0, 12 and 13 will be group 1, and so on.
Then you can apply the row_number window function to generate the numbering partitioned by that group:
with VW_GROUPED as (
select
t.*,
(select count(*) from TheTable x where x.URN <= t.URN and x.GAPNOOFDAYS > 1) as GROUPNO
from
TheTable /* <- your table name here */ t)
select
g.URN,
g.CUSTOMER_ID,
g.GAPNOOFDAYS,
row_number() over (partition by GROUPNO order by URN) as "Counter I need to generate"
from
VW_GROUPED g
Here's an alternate example that generates the group in using analytic functions instead of a scalar subquery:
with grp as (
select t.*
, sum(case gapnoofdays when 1 then 0 else 1 end) over (partition by customer_id order by urn) grp
from your_table t
)
select grp.*
, row_number() over (partition by customer_id, grp order by urn) n
from grp;
I'm trying to get the maximum value of a count. The code is as follows
SELECT coachID, COUNT(coachID)
FROM coaches_awards GROUP BY coachID
HAVING COUNT(coachID) =
(
SELECT MAX(t2.awards)
FROM (
SELECT coachID, count(coachID) as awards
FROM coaches_awards
GROUP BY coachID
) t2
);
Yet something keeps failing. The inner query works and gives the answer that I want and the outer query will work if the inner query is replaced by the number required. So I'm assuming I've made some syntax error.
Where am I going wrong?
If you are just looking for one row, why not do:
SELECT coachID, COUNT(coachID) as cnt
FROM coaches_awards
GROUP BY coachID
ORDER BY cnt DESC
LIMIT 1;
If you want ties, then use RANK() or DENSE_RANK():
SELECT ca.*
FROM (SELECT coachID, COUNT(*) as cnt,
RANK() OVER (ORDER BY COUNT(*) DESC) as seqnum
FROM coaches_awards
GROUP BY coachID
) ca
WHERE seqnum = 1;
I'm trying to run this query in Hive to return only the top 10 url which appear more often in the adimpression table.
select
ranked_mytable.url,
ranked_mytable.cnt
from
( select iq.url, iq.cnt, rank() over (partition by iq.url order by iq.cnt desc) rnk
from
( select url, count(*) cnt
from store.adimpression ai
inner join zuppa.adgroupcreativesubscription agcs
on agcs.id = ai.adgroupcreativesubscriptionid
inner join zuppa.adgroup ag
on ag.id = agcs.adgroupid
where ai.datehour >= '2014-05-15 00:00:00'
and ag.siteid = 1240
group by url
) iq
) ranked_mytable
where
ranked_mytable.rnk <= 10
order by
ranked_mytable.url,
ranked_mytable.rnk desc
;
Unfortunately I get an error message stating:
FAILED: SemanticException [Error 10002]: Line 26:23 Invalid column reference 'rnk'
I've tried to debug it and until the ranked_mytable sub-queries everything goes smooth. I've tried to comment the where ranked_mytable.rnk <= 10 clause but the error message keep appearing.
Hive is unable to order by a column that is not in the "output" of a select statement. To fix it, just include that column in the selected columns:
select
ranked_mytable.url,
ranked_mytable.cnt,
ranked_mytable.rnk
from
( select iq.url, iq.cnt, rank() over (partition by iq.url order by iq.cnt desc) rnk
from
( select url, count(*) cnt
from store.adimpression ai
inner join zuppa.adgroupcreativesubscription agcs
on agcs.id = ai.adgroupcreativesubscriptionid
inner join zuppa.adgroup ag
on ag.id = agcs.adgroupid
where ai.datehour >= '2014-05-15 00:00:00'
and ag.siteid = 1240
group by url
) iq
) ranked_mytable
where
ranked_mytable.rnk <= 10
order by
ranked_mytable.url,
ranked_mytable.rnk desc
;
If you don't want that 'rnk' column in your final output, I expect you could wrap that whole thing in another inner-query and just select out the 'url' and 'cnt' fields.
RANK OVER is not the best function to achieve this goal.
A better solution would be to use a combination of SORT BY and LIMIT. It's true in fact LIMIT picks randomly the rows in a table, but this might be avoided if used with the SORT BY function. From the Apache Wiki:
-- Top k queries. The following query returns the top 5 sales records wrt amount.
SET mapred.reduce.tasks = 1 SELECT * FROM sales SORT BY amount
DESC LIMIT 5
The query can be re-written in this way:
select
iq.url,
iq.cnt
from
( select url, count(*) cnt
from store.adimpression ai
inner join zuppa.adgroupcreativesubscription agcs
on agcs.id = ai.adgroupcreativesubscriptionid
inner join zuppa.adgroup ag
on ag.id = agcs.adgroupid
where ai.datehour >= '2014-05-15 00:00:00'
and ag.siteid = 1240
group by url ) iq
sort by
iq.cnt desc
limit
10
;
Remove the partition by iq.url clause from rank over() and re-run query.
Thanks & Regards,
Kamleshkumar Gujarathi
Put as before the rnk variable. It should work fine.