I have two tables.
Food Table
--------------------------
ID CityID FoodName
--------------------------
1 1 FoodA
2 1 FoodB
3 1 FoodC
4 2 FoodW
5 2 FoodX
6 2 FoodY
7 2 FoodZ
City Table
--------------------------
ID CityName
--------------------------
1 Memphis
2 Nashville
3 Chattanooga
So How can I use CityName s as Column title and list the food in that city.
--------------------------------------
Memphis Nashville Chattanooga
--------------------------------------
FoodA FoodW
FoodB FoodX
FoodC FoodY
FoodZ
I'm pretty sure on that I have to use pivot but I couldn't find a good solution yet.
This is what I've achieved so far.
SELECT *
FROM (
SELECT *
FROM Food F
INNER JOIN City C ON C.ID = F.CityID
) DataTable D
PIVOT(F.FoodName FOR C.CityName IN (
[Memphis]
,[Nashville]
,[Chattanooga]
)) PivotTable
you can use this query to get your output. Actually you did some mistakes to setup the pivot query.
select Memphis,Nashville,Chattanooga
from
(
select f.ID,c.CityName,f.FoodName
from Food f
inner join City c
on f.CityID=c.id
)result
pivot
(
max(FoodName)
for CityName in(Memphis,Nashville,Chattanooga)
) as pvt
The PIVOT operator uses the columns from the data table that are not in the PIVOT definition as GROUP anchor.
That mean that two values will be in the same row of a PIVOT table when they have the same value in the columns of data table that are neither the aggregated one or the pivoted one.
The OP data don't have this value so a new partitioned id is generated.
SELECT Memphis, Nashville, Chattanooga
FROM (SELECT c.CityName, f.FoodName
, FoodID = Row_Number() OVER (PARTITION BY c.ID ORDER BY FoodName)
FROM Food f
INNER JOIN City c ON f.CityID = c.id) d
PIVOT
(MAX(FoodName) FOR CityName IN (Memphis,Nashville,Chattanooga)) pvt
Related
Master table
SerNo HospitalId CityId
1 1 1
2 1 1
3 2 2
4 3 2
5 1 1
HospitalMaster
HospitalId HospitalName
1 ABC
2 XYZ
CityMaster
CityId City
1 Delhi
2 Bombay
Result
I need something like this
City TotalHospital
Delhi 1
Bombay 2
I tried joining the tables but I keep getting the total rows of the columns and not of the hospitals.
Thank you.
Left join the city master table to a subquery which finds the hospital counts for each city. Note carefully that we only count distinct hospitals, because a hospital city relationship may appear more than once in the master table.
SELECT t1.City, COALESCE(t2.cnt, 0) AS TotalHospital
FROM CityMaster t1
LEFT JOIN
(
SELECT CityId, COUNT(DISTINCT HospitalId) cnt
FROM Master
GROUP BY CityID
) t2
ON t1.CityId = t2.CityId;
Demo
Try this:
SELECT C.City,COUNT(DISTINCT HospitalID)TotalHospital
FROM CityMaster C
JOIN Master_table M ON M.CityId=C.CityId
GROUP BY C.City
You could apply join
select M.City,count(distinct M.HospitalId) from CityMaster C inner join Master M ON C.CityId = M.CityId
group by M.City
You can do it with using JOIN
Just replace #city, #hospital, #table with your table names.
select C.City,T.CityId from #city C,#hosp H,#table T WHERE T.CityId = C.CityId AND T.HospitalId = H.HospitalId Group by C.City,T.CityId
As we need city name along with count, we can get by join city master and master tables.
select max(C.cityname), count(distinct M.HospitalId)
from CityMaster C
inner join Master M
on C.Cityid = M.CityId
group by M.cityid
I'm trying to INNER JOIN 3 tables together with a PIVOT on the third table. Joining isn't an issue but PIVOT's are pretty new to me and combining them together has turned into a disaster. I'm not sure how to do the following:
Table 1
ID Mnemonic Gender
1 SKYL F
2 HANS M
Table 2
ID LastName FirstName
1 Skywalker Leia
2 Solo Han
Table 3
ID Query Response
1 a red
1 b green
1 c blue
1 d yellow
2 a black
2 b white
2 c orange
2 d purple
Final Table
ID Mnemonic Gender LastName FirstName Query_a Query_b
1 SKYL F Skywalker Leia red green
2 HANS M Solo Han black white
One area I know I'm having issues is that I dont want all the 'Responses' from Table 3, just when the 'Query' column is 'a' or 'b'. I might end up creating 2 new tables to replace Table 3, so I can get rid of the PIVOT all together and just INNER JOIN the 4 tables.
I followed along with SQL server join tables and pivot but could not get it to work with more than 2 tables with not all Queries needed to be PIVOT'ed.
you only need to Pivot table 3 - so just pivot Table 3 with a CTE expression as below and then join the result with Table 1 and 2
WITH pivot_cte
(
id,
query_a,
query_b
)
AS
-- Define the CTE query.
(
SELECT *
FROM (
SELECT Id, a query_a,
b query_b
FROM table3 ) table3 PIVOT ( Max(response) FOR query IN ([a],
[b]) ) piv;)
SELECT *
FROM pivot_cte
JOIN table1
ON table1.id=pivot_cte.id
JOIN table2
ON table2.id=pivot_cte.id
I'm trying to select all company rows from a [Company] table that share with at least one other company, the same number of employees (from an [Employee] table that has a CompanyId column), where each group of respective employees share the same set of LocationIds (a column in the [Employee] table) and in the same proportion.
So, for instance, two companies with three employees each that have the locationIds 1,2, and 2, would be selected by this query.
[Employee]
EmployeeId | CompanyId | LocationId |
========================================
1 | 1 | 1
2 | 1 | 2
3 | 1 | 2
4 | 2 | 1
5 | 2 | 2
6 | 2 | 2
7 | 3 | 3
[Company]
CompanyId |
============
1 |
2 |
3 |
Returns the CompanyIds:
======================
1
2
CompanyIds 1 and 2 are selected because they share in common with at least one other company: 1. the number of employees (3 employees); and 2. the number/proportion of LocationIds associated with those employees (1 employee has LocationId 1 and 2 employees have LocationId 2).
So far I think I want to use a HAVING COUNT(?) > 1 statement, but I'm having trouble working out the details. Does anyone have any suggestions?
This is ugly, but the only way I can think of to do it:
;with CTE as (
select c.Id,
(
select e.Location, count(e.Id) [EmployeeCount]
from Employee e
where e.IdCompany=c.Id
group by e.Location
order by e.Location
for xml auto
) LocationEmployeeData
from Company c
)
select c.Id
from Company c
join (
select x.LocationEmployeeData, count(x.Id) [CompanyCount]
from CTE x
group by x.LocationEmployeeData
having count(x.Id) >= 2
) y on y.LocationEmployeeData = (select LocationEmployeeData from CTE where Id = c.Id)
See fiddle: http://www.sqlfiddle.com/#!6/6bc16/5
It works by encoding the Employee count per Location data (multiple rows) into an xml string for each Company.
The CTE code on its own:
select c.Id,
(
select e.Location, count(e.Id) [EmployeeCount]
from Employee e
where e.IdCompany=c.Id
group by e.Location
order by e.Location
for xml auto
) LocationEmployeeData
from Company c
Produces data like:
Id LocationEmployeeData
1 <e Location="1" EmployeeCount="2"/><e Location="2" EmployeeCount="1"/>
2 <e Location="1" EmployeeCount="2"/><e Location="2" EmployeeCount="1"/>
3 <e Location="3" EmployeeCount="1"/>
Then it compares companies based on this string (rather than trying to ascertain whether multiple rows match, etc).
An alternative solution could look like this. However it also requires performance testing in advance (I don't feel quite confident with <> type join).
with List as
(
select
IdCompany,
Location,
row_number() over (partition by IdCompany order by Location) as RowId,
count(1) over (partition by IdCompany) as LocCount
from
Employee
)
select
A.IdCompany
from List as A
inner join List as B on A.IdCompany <> B.IdCompany
and A.RowID = B.RowID
and A.LocCount = B.LocCount
group by
A.IdCompany, A.LocCount
having
sum(case when A.Location = B.Location then 1 else 0 end) = A.LocCount
Related fiddle: http://sqlfiddle.com/#!6/d9f2e/1
I have a table like this
Table A:
Id Count
1 4
1 16
1 8
2 10
2 15
3 18
etc
Table B:
1 sample1.file
2 sample2.file
3 sample3.file
TABLE C:
Count fileNumber
16 1234
4 2345
15 3456
18 4567
and so on...
What I want is this
1 sample1.file 1234
2 sample2.file 3456
3 sample3.file 4567
To get the max value from table A I used
Select MAX (Count) from A where Id='1'
This works well but my problem is when combining data with another table.
When I join Table B and Table A, I need to get the MAX for all Ids and in my query I dont know what Id is.
This is my query
SELECT B.*,C.*
JOIN A on A.Id = B.ID
JOIN C on A.id = B.ID
WHERE (SELECT MAX(COUNT)
FROM A
WHERE Id = <what goes here????>)
To summarise, what I want is Values from Table B, FileNumber from Table c (where the count is Max for ID from table A).
UPDATE: COrrecting table C above. Looks like I need Table A.
I think this is the query you're looking for:
select b.*, c.filenumber from b
join (
select id, max(count) as count from a
group by id
) as NewA on b.id = NewA.id
join c on NewA.count = c.count
However, you should take into account that I don't get why for id=1 in tableA you choose the 16 to match against table C (which is the max) and for id=2 in tableA you choose the 10 to match against table C (which is the min). I assumed you meant the max in both cases.
Edit:
I see you've updated tableA data. The query results in this, given the previous data:
+----+---------------+------------+
| ID | FILENAME | FILENUMBER |
+----+---------------+------------+
| 1 | sample1.file | 1234 |
| 2 | sample2.file | 3456 |
| 3 | sample3.file | 4567 |
+----+---------------+------------+
Here is a working example
Using Mosty’s working example (renaming the keyword count to cnt for a column name), this is another approach:
with abc as (
select
a.id,
a.cnt,
rank() over (
partition by a.id
order by cnt desc
) as rk,
b.filename
from a join b on a.id = b.id
)
select
abc.id, abc.filename, c.filenumber
from abc join c
on c.cnt = abc.cnt
where rk = 1;
select
PreMax.ID,
B.FileName,
C2.FileNumber
from
( select C.id, max( C.count ) maxPerID
from TableC C
group by C.ID
order by C.ID ) PreMax
JOIN TableC C2
on PreMax.ID = C2.ID
AND PreMax.maxPerID = C2.Count
JOIN TableB B
on PreMax.ID = B.ID
The Query:
SELECT MemberId, a.MemberName, GROUP_CONCAT(FruitName) FROM a LEFT JOIN b ON
a.MemberName = b.MemberName GROUP BY a.MemberName
Table a
MemberID MemberName
-------------- ----------
1 Al
1 Al
3 A2
Table b
MemberName FruitName
--------------- --------------
Al Apple
Al Mango
A2 Cherry
Resulting Output from above query:
MemberId MemberName GROUP_CONCAT(FruitName)
3 A2 Cherry
1 A1 Apple,Apple,Mango,Mango
The actual tables I am using have 10 columns apiece so just storing everything in one table is not a workaround. That said, how can I change the query to only return 'Apple,Mango' for MemberName?
Add the keyword DISTINCT to the grouped column:
GROUP_CONCAT(DISTINCT FruitName)
try
GROUP_CONCAT(Distinct FruitName)
SELECT MemberId, a.MemberName, GROUP_CONCAT(DISTINCT FruitName)
FROM a
LEFT JOIN
b
ON a.MemberName = b.MemberName
GROUP BY
a.MemberName