extracting records from rank = 1 - postgresql

I would like to get name of title that have the number 1 in the rank column.
SELECT title, RANK() OVER(ORDER BY COUNT(*) DESC) rank
FROM rentals as w join copies as e on w.signature = e.signature join books as c on e.idbook = c.idbook
WHERE dateofloan <= CURRENT_DATE - 31
GROUP BY title;
My code shows two columns
title, rank
Thank you in advance for your help.


Subquery and restrict to the first rank:
WITH cte AS (
SELECT title, RANK() OVER (ORDER BY COUNT(*) DESC) rnk
FROM rentals w
INNER JOIN copies e ON w.signature = e.signature
INNER JOIN books c ON e.idbook = c.idbook
WHERE dateofloan <= CURRENT_DATE - 31
GROUP BY title
)
SELECT title
FROM cte
WHERE rnk = 1;

Related

Select specific lines in data according to last update [duplicate]

Name Value AnotherColumn
-----------
Pump 1 8000.0 Something1
Pump 1 10000.0 Something2
Pump 1 10000.0 Something3
Pump 2 3043 Something4
Pump 2 4594 Something5
Pump 2 6165 Something6
My table looks something like this. I would like to know how to select max value for each pump.
select a.name, value from out_pumptable as a,
(select name, max(value) as value from out_pumptable where group by posnumber)g where and g.value = value
this code does the job, but i get two entries of Pump 1 since it has two entries with same value.

select name, max(value)
from out_pumptable
group by name

select name, value
from( select name, value, ROW_NUMBER() OVER(PARTITION BY name ORDER BY value desc) as rn
from out_pumptable ) as a
where rn = 1

SELECT
b.name,
MAX(b.value) as MaxValue,
MAX(b.Anothercolumn) as AnotherColumn
FROM out_pumptabl
INNER JOIN (SELECT
name,
MAX(value) as MaxValue
FROM out_pumptabl
GROUP BY Name) a ON
a.name = b.name AND a.maxValue = b.value
GROUP BY b.Name
Note this would be far easier if you had a primary key. Here is an Example
SELECT * FROM out_pumptabl c
WHERE PK in
(SELECT
MAX(PK) as MaxPK
FROM out_pumptabl b
INNER JOIN (SELECT
name,
MAX(value) as MaxValue
FROM out_pumptabl
GROUP BY Name) a ON
a.name = b.name AND a.maxValue = b.value)

select Name, Value, AnotherColumn
from out_pumptable
where Value =
(
select Max(Value)
from out_pumptable as f where f.Name=out_pumptable.Name
)
group by Name, Value, AnotherColumn
Try like this, It works.

select * from (select * from table order by value desc limit 999999999) v group by v.name

Using analytic function is the easy way to find max value of every group.
Documentation : https://learn.microsoft.com/en-us/sql/t-sql/functions/row-number-transact-sql?view=sql-server-ver15
Select name,
value,
AnotherColumn
From(
SELECT Row_Number() over(partition by name order by value desc)as
row_number, *
FROM students
)
Where row_number = 1

SELECT t1.name, t1.Value, t1.AnotherColumn
FROM mytable t1
JOIN (SELECT name AS nameMax, MAX(Value) as valueMax
FROM mytable
GROUP BY name) AS t2
ON t2.nameMax = t1.name AND t2.valueMax = t1.Value
WHERE 1 OR <anything you would like>
GROUP BY t1.name;

SELECT DISTINCT (t1.ProdId), t1.Quantity FROM Dummy t1 INNER JOIN
(SELECT ProdId, MAX(Quantity) as MaxQuantity FROM Dummy GROUP BY ProdId) t2
ON t1.ProdId = t2.ProdId
AND t1.Quantity = t2.MaxQuantity
ORDER BY t1.ProdId
this will give you the idea.

Select the last record for the date and time columns

I need to select the last record in the academic table which has two columns for date and time. When I run the query I get an error. Only one expression can be specified in the select list when the subquery is not introduced with EXISTS.
USE PCUnitTest
SELECT C.ACCOUNTNO, C.CONTACT, C.LASTNAME, C.KEY4, A.PEOPLE_ID, A.APP_STATUS, A.APP_DECISION, A.REVISION_DATE, A.REVISION_TIME
FROM ACADEMIC AS A INNER JOIN
GM.dbo.CONTACT1 AS C ON A.PEOPLE_ID = C.KEY4
WHERE A.REVISION_DATE = (SELECT TOP (1) REVISION_DATE, REVISION_TIME, PEOPLE_CODE, PEOPLE_ID, PEOPLE_CODE_ID, ACADEMIC_YEAR, ACADEMIC_TERM, ACADEMIC_SESSION, PROGRAM, DEGREE, CURRICULUM
FROM PCUnitTest.dbo.ACADEMIC
ORDER BY REVISION_DATE DESC, REVISION_TIME DESC)

You can Join the query you are using in the where
USE PowerCampusUnitTest
SELECT C.ACCOUNTNO, C.CONTACT, C.LASTNAME, C.KEY4, A.PEOPLE_ID, A.APP_STATUS, A.APP_DECISION, A.REVISION_DATE, A.REVISION_TIME
FROM ACADEMIC AS A
INNER JOIN GoldMineUnitTest.dbo.CONTACT1 AS C
ON A.PEOPLE_ID = C.KEY4
INNER JOIN (
SELECT TOP 1 A2.REVISION_DATE,A2.REVISION_TIME FROM PowerCampusUnitTest.dbo.ACADEMIC A2
ORDER BY REVISION_DATE DESC, REVISION_TIME DESC
)AS A2
ON A.REVISION_DATE = A2.REVISION_DATE AND A.REVISION_TIME = A2.REVISION_TIME

Use ROW_NUMBER()
USE PCUnitTest
SELECT
R.ACCOUNTNO, R.CONTACT, R.LASTNAME, R.KEY4, R.PEOPLE_ID, R.APP_STATUS, R.APP_DECISION, R.REVISION_DATE, R.REVISION_TIME
FROM
(
SELECT C.ACCOUNTNO, C.CONTACT, C.LASTNAME, C.KEY4, A.PEOPLE_ID, A.APP_STATUS, A.APP_DECISION, A.REVISION_DATE, A.REVISION_TIME
,ROW_NUMBER() OVER (ORDER BY A.REVISION_DATE DESC, A.REVISION_TIME DESC) RN
FROM ACADEMIC AS A INNER JOIN
GMUnitTest.dbo.CONTACT1 AS C ON A.PEOPLE_ID = C.KEY4
) R
WHERE RN=1
If you want to get the latest row for each PEOPLE_ID, then add PARTITION BY
SELECT
R.ACCOUNTNO, R.CONTACT, R.LASTNAME, R.KEY4, R.PEOPLE_ID, R.APP_STATUS, R.APP_DECISION, R.REVISION_DATE, R.REVISION_TIME
FROM
(
SELECT C.ACCOUNTNO, C.CONTACT, C.LASTNAME, C.KEY4, A.PEOPLE_ID, A.APP_STATUS, A.APP_DECISION, A.REVISION_DATE, A.REVISION_TIME
,ROW_NUMBER() OVER (PARTITION BY A.PEOPLE_ID ORDER BY A.REVISION_DATE DESC, A.REVISION_TIME DESC) RN
FROM ACADEMIC AS A INNER JOIN
GMUnitTest.dbo.CONTACT1 AS C ON A.PEOPLE_ID = C.KEY4
) R
WHERE RN=1

Use an Alias in Where Clause Subquery in Oracle

i need to show some field from another table in oracle here is my query
SELECT
ANGGARAN.SIMPEG_PEGAWAI.ID_PEGAWAI AS KODE,
ANGGARAN.SIMPEG_PEGAWAI.NAMA,
ANGGARAN.SIMPEG_PEGAWAI.NIP,
ANGGARAN.SIMPEG_ESELON_JABATAN.JABATAN,
ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.GOLONGAN,
ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.PANGKAT,
(SELECT *
FROM (SELECT CONCAT(TO_CHAR(abs(sysdate - TO_DATE(TMT_JABATAN))/360,'9,999,999.9'),' TAHUN')
FROM SIMPEG_JABATAN where ID_PEGAWAI=KODE ORDER BY TMT_JABATAN desc)
WHERE ROWNUM = 1) AS MASA_KERJA
FROM
ANGGARAN.SIMPEG_PEGAWAI
INNER JOIN ANGGARAN.SIMPEG_ESELON_JABATAN
ON ANGGARAN.SIMPEG_PEGAWAI.ESELON_JABATAN = ANGGARAN.SIMPEG_ESELON_JABATAN.ID_ESELON_JABATAN
INNER JOIN ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT
ON ANGGARAN.SIMPEG_PEGAWAI.PANGKAT = ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.ID_GOLONGAN_PANGKAT
WHERE
ANGGARAN.SIMPEG_PEGAWAI.ST_AKTIF = 1 AND
ANGGARAN.SIMPEG_PEGAWAI.ESELON2 <> 1 AND
ANGGARAN.SIMPEG_PEGAWAI.PANGKAT >= 12 AND
ANGGARAN.SIMPEG_ESELON_JABATAN.STATUS = 1 AND
ANGGARAN.SIMPEG_ESELON_JABATAN.ID_ESELON2=2
ORDER BY
ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.SORT DESC
result i got
[Err] ORA-00904: "KODE": invalid identifier
the KODE come from query ANGGARAN.SIMPEG_PEGAWAI.ID_PEGAWAI AS KODE, and used for this query
(SELECT *
FROM (SELECT CONCAT(TO_CHAR(abs(sysdate - TO_DATE(TMT_JABATAN))/360,'9,999,999.9'),' TAHUN')
FROM SIMPEG_JABATAN where ID_PEGAWAI=KODE ORDER BY TMT_JABATAN desc)
WHERE ROWNUM = 1) AS MASA_KERJA
that i miss something ? or that could be worogn using an alias in subquery where clause in oracle database ?

You can use an identifier defined in an external query in only one level deep queries. You have to rethink your strategy. My suggestion is to remove the subquery from the select list and put it in the FROM clause. And add another rownumber column like this:
(SELECT
ID_PEGAWAI,
CONCAT(TO_CHAR(abs(sysdate - TO_DATE(TMT_JABATAN))/360,'9,999,999.9'),' TAHUN') MASA_KERJA,
ROW_NUMBER() OVER (PARTITION BY ID_PEGAWAI ORDER BY TMT_JABATAN DESC) rownumber
FROM SIMPEG_JABATAN) xxx
And join like:
ON ANGGARAN.SIMPEG_PEGAWAI = xxx.ID_PEGAWAI
Then in the where clause you can do simply:
WHERE
....
AND xxx.rownumber = 1
Complete query:
SELECT
ANGGARAN.SIMPEG_PEGAWAI.ID_PEGAWAI AS KODE,
ANGGARAN.SIMPEG_PEGAWAI.NAMA,
ANGGARAN.SIMPEG_PEGAWAI.NIP,
ANGGARAN.SIMPEG_ESELON_JABATAN.JABATAN,
ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.GOLONGAN,
ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.PANGKAT
FROM
ANGGARAN.SIMPEG_PEGAWAI
INNER JOIN ANGGARAN.SIMPEG_ESELON_JABATAN
ON ANGGARAN.SIMPEG_PEGAWAI.ESELON_JABATAN = ANGGARAN.SIMPEG_ESELON_JABATAN.ID_ESELON_JABATAN
INNER JOIN ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT
ON ANGGARAN.SIMPEG_PEGAWAI.PANGKAT = ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.ID_GOLONGAN_PANGKAT
INNER JOIN (
SELECT
ID_PEGAWAI,
CONCAT(TO_CHAR(abs(sysdate - TO_DATE(TMT_JABATAN))/360,'9,999,999.9'),' TAHUN') MASA_KERJA,
ROW_NUMBER() OVER (PARTITION BY ID_PEGAWAI ORDER BY TMT_JABATAN DESC) rownumber
FROM SIMPEG_JABATAN
) xxx
ON ANGGARAN.SIMPEG_PEGAWAI.ID_PEGAWAI = xxx.ID_PEGAWAI
WHERE
ANGGARAN.SIMPEG_PEGAWAI.ST_AKTIF = 1 AND
ANGGARAN.SIMPEG_PEGAWAI.ESELON2 <> 1 AND
ANGGARAN.SIMPEG_PEGAWAI.PANGKAT >= 12 AND
ANGGARAN.SIMPEG_ESELON_JABATAN.STATUS = 1 AND
ANGGARAN.SIMPEG_ESELON_JABATAN.ID_ESELON2=2 AND
xxx.rownumber = 1
ORDER BY ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.SORT DESC

Oracle does not support columns aliases in WHERE clauses (or similar situations like here). You have to name the column again (by its original name).
select dummy as kode from dual where kode = 'X'
> ORA-00904: "KODE": invalid identifier

You need to assign an alias in the level below to use it in a query (I haven't checked the syntax and workability of your query, just changed the part which is essential to answer your question):
SELECT
TMP.KODE,
TMP.NAMA,
TMP.NIP,
ANGGARAN.SIMPEG_ESELON_JABATAN.JABATAN,
ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.GOLONGAN,
ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.PANGKAT,
(SELECT *
FROM (SELECT CONCAT(TO_CHAR(abs(sysdate - TO_DATE(TMT_JABATAN))/360,'9,999,999.9'),' TAHUN')
FROM SIMPEG_JABATAN where ID_PEGAWAI=TMP.KODE ORDER BY TMT_JABATAN desc)
WHERE ROWNUM = 1) AS MASA_KERJA
FROM
(SELECT ANGGARAN.SIMPEG_PEGAWAI.ID_PEGAWAI AS KODE, ANGGARAN.SIMPEG_PEGAWAI.* FROM ANGGARAN.SIMPEG_PEGAWAI) TMP
INNER JOIN ANGGARAN.SIMPEG_ESELON_JABATAN
ON TMP.ESELON_JABATAN = ANGGARAN.SIMPEG_ESELON_JABATAN.ID_ESELON_JABATAN
INNER JOIN ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT
ON TMP.PANGKAT = ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.ID_GOLONGAN_PANGKAT
WHERE
TMP.ST_AKTIF = 1 AND
TMP.ESELON2 <> 1 AND
TMP.PANGKAT >= 12 AND
ANGGARAN.SIMPEG_ESELON_JABATAN.STATUS = 1 AND
ANGGARAN.SIMPEG_ESELON_JABATAN.ID_ESELON2=2
ORDER BY
ANGGARAN.SIMPEG_KODE_GOLONGAN_PANGKAT.SORT DESC

Is T-SQL (2005) RANK OVER(PARTITION BY) the answer?

I have a stored procedure that does paging for the front end and is working fine. I now need to modify that procedure to group by four columns of the 20 returned and then only return the row within each group that contains the lowest priority. So when resort_id, bedrooms, kitchen and checkin (date) all match then only return the row that has the min priority. I have to still maintain the paging functionality. The #startIndex and #upperbound are parms passed into the procedure from the front end for paging. I’m thinking that RANK OVER (PARTITION BY) is the answer I just can’t quite figure out how to put it all together.
SELECT I.id,
I.resort_id,
I.[bedrooms],
I.[kitchen],
I.[checkin],
I.[priority],
I.col_1,
I.col_2 /* ..... (more cols) */
FROM (
SELECT ROW_NUMBER() OVER(ORDER by checkin) AS rowNumber,
*
FROM Inventory
) AS I
WHERE rowNumber >= #startIndex
AND rowNumber < #upperBound
ORDER BY rowNumber
Example 2 after fix:
SELECT I.resort_id,
I.[bedrooms],
I.[kitchen],
I.[checkin],
I.[priority],
I.col_1,
I.col_2 /* ..... (more cols) */
FROM Inventory i
JOIN
(
SELECT ROW_NUMBER() OVER(ORDER BY h.checkin) as rowNumber, MIN(h.id) as id
FROM Inventory h
JOIN (
SELECT resort_id, bedrooms, kitchen, checkin, id, MIN(priority) as priority
FROM Inventory
GROUP BY resort_id, bedrooms, kitchen, checkin, id
) h2 on h.resort_id = h2.resort_id and
h.bedrooms = h2.bedrooms and
h.kitchen = h2.kitchen and
h.checkin = h2.checkin and
h.priority = h2.priority
GROUP BY h.resort_id, h.bedrooms, h.kitchen, h.checkin, h.priority
) AS I2
on i.id = i2.id
WHERE rowNumber >= #startIndex
AND rowNumber < #upperBound
ORDER BY rowNumber

I would accompish it this way.
SELECT I.resort_id,
I.[bedrooms],
I.[kitchen],
I.[checkin],
I.[priority],
I.col_1,
I.col_2 /* ..... (more cols) */
FROM Inventory i
JOIN
(
SELECT ROW_NUMBER(ORDER BY Checkin) as rowNumber, MIN(id) id
FROM Inventory h
JOIN (
SELECT resort_id, bedrooms, kitchen, checkin id, MIN(priority) as priority
FROM Inventory
GROUP BY resort_id, bedrooms, kitchen, checkin
) h2 on h.resort_id = h2.resort and
h.bedrooms = h2.bedrooms and
h.kitchen = h2.kitchen and
h.checkin = h2.checkin and
h.priority = h2.priority
GROUP BY h.resort_id, h.bedrooms, h.kitchen, h.checkin, h.priority
) AS I2
on i.id = i2.id
WHERE rowNumber >= #startIndex
AND rowNumber < #upperBound
ORDER BY rowNumber

How to display rollup data in new column?

I have the following query which returns the number of android questions per each day on StackOverflow in the year of 2011. I want to get the sum of all the questions asked during the year 2011. For this I am using ROLLUP.
select
year(p.CreationDate) as [Year],
month(p.CreationDate) as [Month],
day(p.CreationDate) as [Day],
count(*) as [QuestionsAskedToday]
from Posts p
inner join PostTags pt on p.id = pt.postid
inner join Tags t on t.id = pt.tagid
where
t.tagname = 'android' and
p.CreationDate > '2011-01-01 00:00:00'
group by year(p.CreationDate), month(p.CreationDate),day(p.CreationDate)
​with rollup
order by year(p.CreationDate), month(p.CreationDate) desc,day(p.CreationDate) desc​
This is the output:
The sum of all questions asked on each day in 2011 is being displayed in the QuestionsAskedToday column itself.
Is there a way to display the rollup in a new column with an alias?
Link to the query

To show this as a column rather than a row you can use SUM(COUNT(*)) OVER () instead of ROLLUP. (Online Demo)
SELECT YEAR(p.CreationDate) AS [Year],
MONTH(p.CreationDate) AS [Month],
DAY(p.CreationDate) AS [Day],
COUNT(*) AS [QuestionsAskedToday],
SUM(COUNT(*)) OVER () AS [Total]
FROM Posts p
INNER JOIN PostTags pt
ON p.id = pt.postid
INNER JOIN Tags t
ON t.id = pt.tagid
WHERE t.tagname = 'android'
AND p.CreationDate > '2011-01-01 00:00:00'
GROUP BY YEAR(p.CreationDate),
MONTH(p.CreationDate),
DAY(p.CreationDate)
ORDER BY YEAR(p.CreationDate),
MONTH(p.CreationDate) DESC,
DAY(p.CreationDate) DESC

You could take an approach like this: Example
SELECT
YEAR(p.CreationDate) AS 'Year'
, CASE
WHEN GROUPING(MONTH(p.CreationDate)) = 0
THEN CAST(MONTH(p.CreationDate) AS VARCHAR(2))
ELSE 'Totals:'
END AS 'Month'
, CASE
WHEN GROUPING(DAY(p.CreationDate)) = 0
THEN CAST(DAY(p.CreationDate) AS VARCHAR(2))
ELSE 'Totals:'
END AS [DAY]
, CASE
WHEN GROUPING(MONTH(p.CreationDate)) = 0
AND GROUPING(DAY(p.CreationDate)) = 0
THEN COUNT(1)
END AS 'QuestionsAskedToday'
, CASE
WHEN GROUPING(MONTH(p.CreationDate)) = 1
OR GROUPING(DAY(p.CreationDate)) = 1
THEN COUNT(1)
END AS 'Totals'
FROM Posts AS p
INNER JOIN PostTags AS pt ON p.id = pt.postid
INNER JOIN Tags AS t ON t.id = pt.tagid
WHERE t.tagname = 'android'
AND p.CreationDate >= '2011-01-01'
GROUP BY ROLLUP(YEAR(p.CreationDate)
, MONTH(p.CreationDate)
, DAY(p.CreationDate))
ORDER BY YEAR(p.CreationDate)
, MONTH(p.CreationDate) DESC
, DAY(p.CreationDate) DESC​​​​​​​
If this is what you wanted, the same technique can be applied to Years as well to total them in the new column, or their own column, if you want to query for multiple years and aggregate them.