I have to write a query to display the value for ID2 when ID=ID. Currently the table looks like the below.
ID
ID2
fname
lname
address1
address2
city
state
123
123
joe
smith
12 main st
los angeles
CA
122
122
james
jones
13 main st
new york
NY
123
3210
joe
smith
14 main st
los angeles
CA
124
124
mary
jones
15 main st
new york
NY
The desired output would look like this. Where I can do some sort of a self join to get the ID2 value.
ID
ID2
fname
lname
address1
address2
city
state
other ID
123
123
joe
smith
12 main st
los angeles
CA
3210
122
122
james
jones
13 main st
new york
NY
124
124
mary
jones
15 main st
new york
NY
Any ideas/suggestions greatly appreciated!
Update:
I was able to get the result with the additional columns using the below script. Thanks all for your assistance on this one!
with cte (id, id2, fname, lname, address1, address2, city, state)
as (select *
from (select *,row_number() over(partition by id order by id desc) as rn from your_table
) x
where rn = 2)
select x.id, x.id2, x.fname, x.lname, x.address1, x.address2, x.city, x.state, c.id2, c.address1
from (select *,row_number() over(partition by id order by id desc) as rn from your_table
) x
left join
cte c on x.id=c.id
where x.rn = 1
dbfiddle below
https://dbfiddle.uk/?rdbms=postgres_9.5&fiddle=4010ab08c5e32d9293d10e985adbfd7a
You could do something like the following, using a correlated subquery; using max ensures it only returns a single row should you have an Id with more than one different ID2:
select *,
(select max(id2) from t t2 where t2.id = t.id and t2.id2 != t.id) OtherId
from t
where id = id2
If you have two rows max with the same id, then you can try this :
SELECT (array_agg(t.*) FILTER (WHERE id = id2))[1].*
, (array_agg(t.id2) FILTER (WHERE id <> id2))[1] AS "other ID"
FROM your_table AS t
GROUP BY id
If you may have more than two rows with the same id then you can try this :
SELECT (array_agg(t.*) FILTER (WHERE id = id2))[1].*
, array_agg(t.id2) FILTER (WHERE id <> id2) AS "other IDs"
FROM your_table AS t
GROUP BY id
see the test result in dbfiddle
Related
The table I am querying has several thousand rows and numerous fields - I'd like the code to return the top 10 values for a handful of the fields, namely: Forename, Surname and City - I'd also like to see a count of the values returned.
For example
Ranking
Forename
FName Frequency
Surname
SName Frequency
City
City Frequency
1
Liam
830,091
Smith
2,353,709
New York
2,679,785
2
Mary
708,390
Johnson
1,562,990
Los Angeles
413,359
3
Noah
639,592
Williams
792,306
Chicago
393,511
4
Patricia
568,410
Brown
743,346
Houston
367,496
5
William
557,049
Jones
633,933
Phoenix
336,929
6
Linda
497,138
Miller
503,523
Philadelphia
304,638
7
James
490,665
Davis
503,115
San Antonio
255,142
8
Barbara
418,312
Garcia
468,683
San Diego
238,521
9
Logan
399,947
Rodriguez
461,816
Dallas
232,718
10
Elizabeth
399,737
Wilson
436,843
San Jose
213,483
The returned list should be interpreted thus:
The most frequently occurring forename in the table is Liam - with 830,091 instances,
The 5th most frequently occurring forename is William - with 557,049 instances,
The 8th most frequently occurring city is San Diego - with 238,521 instances
...and so on
(N.b. the table does not show there are 2.7m Liams in New York - just that there are 830,091 Liams in the entire table - and that there are 2,679,785 New York addresses in the entire table)
The following produces what I need - but just for the first field (Forename) - I'd like to be able to do the same for three fields
SELECT Forename, COUNT(Forename) AS FName_Frequency
FROM Customer_Table
GROUP BY Forename
ORDER BY FName_Frequency DESC
limit 10
Thanks in anticipation
I would just put this in separate rows:
select 'forename', forename, count(*) as freq
from customer_table
group by forename
order by freq desc
fetch first 10 rows only
union all
select 'surname', surname, count(*) as freq
from customer_table
group by surname
order by freq desc
fetch first 10 rows only
union all
select 'city', city, count(*) as freq
from customer_table
group by city
order by freq desc
fetch first 10 rows only;
Note that this uses Standard SQL syntax, because you have not tagged with the question with the database you are using. You can also put this in separate columns, using:
select max(case when which = 'forename' then col end),
max(case when which = 'forename' then freq end),
max(case when which = 'surname' then col end),
max(case when which = 'surname' then freq end),
max(case when which = 'city' then col end),
max(case when which = 'city' then freq end)
from ((select 'forename' as which, forename as col, count(*) as freq,
row_number() over (order by count(*) desc) as seqnum
from customer_table
group by forename
) union all
(select 'surname' as which, surname, count(*) as freq
row_number() over (order by count(*) desc) as seqnum
from customer_table
group by surname
) union all
(select 'city', city, count(*) as freq,
row_number() over (order by count(*) desc) as seqnum
from customer_table
group by city
)
) x
group by seqnum;
I'm trying to match and align data, or resaid, count occurrences and then list for which values those occurrences occur.
Or, in a question: "How many times does each ID value occur, and for what names?"
For example, with this input
Name ID
-------------
jim 123
jim 234
jim 345
john 123
john 345
jane 234
jane 345
jan 45678
I want the output to be:
count ID name name name
------------------------------------
3 345 jim john jane
2 123 jim john
2 234 jim jane
1 45678 jan
Or similarly, the input could be (noticing that the ID values are not aligned),
jim john jane jan
----------------------------
123 345 234 45678
234 123 345
345
but that seems to complicate things.
As close as I am to the desired results is in SQL, as
for ID, count(ID)
from table
group by (ID)
order by count desc
which outputs
ID count
------------
345 3
123 2
234 2
45678 1
I'll appreciate help.
You seem to want a pivot. In SQL, you have to specify the number of columns in advance (unless you construct the query as a string).
But the idea is:
select ID, count(*) as cnt,
max(case when seqnum = 1 then name end) as name_1,
max(case when seqnum = 2 then name end) as name_2,
max(case when seqnum = 3 then name end) as name_3
from (select t.*,
row_number() over (partition by id order by id) as seqnum -- arbitrary ordering
from table t
) t
group by ID
order by count desc;
If you have an unknown number of columns, you can aggregate the values into an array:
select ID, count(*) as cnt,
array_agg(name order by name) as names
from table t
group by ID
order by count desc
the query would look similar to this if that's what you're looking for.
SELECT
name,
id,
COUNT(id) as count
FROM
dataSet
WHERE
dataSet.name = 'input'
AND dataSet.id = 'input'
GROUP BY
name,
id
I could get the minimum percentage of two values, but I need only the name, and ID in the select.
ID NAME CITY ONE TWO
--------------------------------------------------
2 Morales Los Angeles 40 10
1 John New York 60 20
4 Mary San Diego 10 10
I need to get the min value of one/two, and to only appear this as a result:
ID NAME
---------
4 Mary
Select ID, NAME
from MYTABLE
where least(ONE,TWO) = (select min(least(ONE,TWO)) from MYTABLE);
If you don't want Morales, then you can do this :
Select ID, NAME
from MYTABLE
where id =
(select id from
(select id from MYTABLE order by least(ONE,TWO), ONE*TWO)
where rownum <= 1);
I have a view which results the following rows.
comp Sub-comp Lognum id Firname LAstname
AK AK-G 0 3897 ABC DEF
AK AK-G 0 5432 mark ray
MC MC-A 0 1234 john steve
MC MC-A 0 5678 dan pitcher
MC MC-A 0 9843 james robin
MC MC-A 84 1234 john steve
MC MC-A 84 5678 dan pitcher
MC MC-A 84 9843 james robin
I want to fetch the only the rows that has a lognum (if the same row has 0 also as lognum) along with the other rows that has just 0 as lognum.
The result table should be like this
comp Sub-comp Lognum id Firname LAstname
AK AK-G 0 3897 ABC DEF
AK AK-G 0 5432 mark ray
MC MC-A 84 1234 john steve
MC MC-A 84 5678 dan pitcher
MC MC-A 84 9843 james robin
And the outline of the query is as follows
create view view1 as
select
comp, Sub-comp, "00" as Lognum, id ,Firname ,LAstname
from
table A
inner joins---
UNION
select
select
comp, Sub-comp, Lognum, id ,Firname ,LAstname from
table B
inner joins----
;
Can anyone help?
Thanks!
Try this:
select * from(
select comp,
Sub-comp,
Lognum,
id,
Firname,
LAstname,
row_number() over(partition by id order by lognum desc) rn
from table_name)
where rn = 1;
This will show the line with the biggest lognum grouped by the ID.
This query should work, even in cases where, for a given id value, you have multiple "non-zero" lognum rows.
If you look at the where clause, rows with non-zero lognum values are always returned (t.Lognum != 0). But rows with zero lognum values will also return, but only if the t.rn = 1 condition is true, which will only happen if there aren't any other non-zero lognums for that same id (see the order by clause of the row_number() window function).
select t.comp,
t.Sub-comp,
t.Lognum,
t.id,
t.Firname,
t.LAstname
from (select t.*,
row_number() over (
partition by t.id
order by case when t.lognum = 0 then 1 else 0 end) as rn
from your_view t) t
where t.Lognum != 0 or t.rn = 1
I have a table sample table as follows:
ID | City
--------------
1 | New York
2 | San Francisco
3 | New York
4 | Los Angeles
5 | Atlanta
I would like to select the distinct City AND the TOP ID for each. E.g., conceptually I would like to do the following
SELECT TOP 1 ID, DISTINCT City
FROM Cities
Should give me:
ID | City
--------------
1 | New York
2 | San Francisco
4 | Los Angeles
5 | Atlanta
Because New York appears twice, it's taken the first ID 1 in this instance.
But I get the error:
Column 'Cities.ID' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.
Try this way:
SELECT min(ID), City
FROM Cities
Group by City
MIN function is used for choose one of the ID from two New York cities.
You need to have your city in a GROUP BY
SELECT MIN(ID), City
FROM Cities
GROUP BY City
More general solution is to use row_number in order to get other details of table:
select * from
(select *, row_number() over(partition by City order by ID) as rn from Cities)
where rn = 1
But for this particular table just grouping will do the work:
select City, Min(ID) as ID
from Cities
group by City
If you have a complex scenario where Group By cannot use, You could use Row_Number() function with Common Table Expression.
;WITH CTE AS
(
SELECT ID, City, ROW_NUMBER() OVER (PARTITION BY City ORDER BY Id) rn
FROM YourTable
)
SELECT Id, City
FROM CTE
WHERE rn = 1