Please see http://sqlfiddle.com/#!3/2506f/2/0
I have two tables. One is a general record, and the other is a table containing related documents that link to that record.
In my example I've created a straightforward query which shows all records and their associated documents. This is fine, but I want a more complex situation.
In the 'mainrecord' table there is a 'multiple' field. If this is 0, then I only want the most recent document from the documents table (that is, with the highest ID). If it is 1, I want to join all linked documents.
So, rather than the result of the query being this:-
ID NAME MULTIPLE DOCUMENTNAME IDLINK
1 One 1 first document 1
1 One 1 second document 1
2 Two 0 third document 2
2 Two 0 fourth document 2
3 Three 1 fifth document 3
3 Three 1 sixth document 3
It should look like this:-
ID NAME MULTIPLE DOCUMENTNAME IDLINK
1 One 1 first document 1
1 One 1 second document 1
2 Two 0 fourth document 2
3 Three 1 fifth document 3
3 Three 1 sixth document 3
Is there a way of including this condition into my query to get the results I'm after. I'm happy to explain further if needed.
Thanks in advance.
WITH myData
AS
(SELECT mainrecord.*, documentlinks.documentName, documentlinks.idlink,
Row_number()
OVER (
partition BY mainrecord.ID
ORDER BY mainrecord.ID ASC) AS ROWNUM
FROM mainrecord INNER JOIN documentlinks
ON mainrecord.id = documentlinks.idlink)
SELECT *
FROM mydata o
WHERE multiple = 0 AND rownum =
(SELECT max(rownum) FROM mydata i WHERE i.id = o.id)
UNION
SELECT *
FROM myData
WHERE multiple = 1
http://sqlfiddle.com/#!3/2506f/57
Another solution (tested at SQL-Fiddle):
SELECT m.*,
d.id as did, d.documentName, d.IDLink
FROM mainrecord AS m
JOIN documentlinks AS d
ON d.IDLink = m.id
AND m.multiple = 1
UNION ALL
SELECT m.*,
d.id as did, d.documentName, d.IDLink
FROM mainrecord AS m
JOIN
( SELECT d.IDLink
, MAX(d.id) AS did
FROM mainrecord AS m
JOIN documentlinks AS d
ON d.IDLink = m.id
AND m.multiple = 0
GROUP BY d.IDLink
) AS g
ON g.IDLink = m.id
JOIN documentlinks AS d
ON d.id = g.did
ORDER BY id, did ;
This will probably do:
SELECT mainrecord.name, documentlinks.documentname
FROM documentlinks
INNER JOIN mainrecord ON mainrecord.id = documentlinks.IDLink AND multiple = 1
UNION
SELECT mainrecord.name, documentlinks.documentname
FROM (SELECT max(id) id, IDLink FROM documentlinks group by IDLink) maxdocuments
INNER JOIN documentlinks ON documentlinks.id = maxdocuments.id
INNER JOIN mainrecord ON mainrecord.id = documentlinks.IDLink AND multiple = 0
How about this:
select * from mainrecord a inner join documentlinks b on a.Id=b.IDLink
where b.id=(case
when a.multiple=1 then b.id
else (select max(id) from documentlinks c where c.IDLink=b.IDLink) end)
SQL FIDDLE
select
m.ID, m.name, m.multiple, dl.idlink,
dl.documentName
from mainrecord as m
left outer join documentlinks as dl on dl.IDlink = m.id
where
m.multiple = 1 or
not exists (select * from documentlinks as t where t.idlink = m.id and t.id < dl.id)
Related
My query is giving me result from grouped data but now I want only two rows
I have tried HAVING COUNT(*) <= 2 but issue is is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.
my query is
select f.CompanyName, f.EmployeeCity, f.PrioritySL ,f.EmployeeSeniorityLevel ,f.EmployeeID
from (
select ConcatKey, min(PrioritySL) as PSL
from dbo.WalkerItContacts group by ConcatKey
) as x inner join dbo.WalkerItContacts as f on f.ConcatKey = x.ConcatKey and f.PrioritySL = x.PSL
where f.PrioritySL != '10'
Company apple have 9 records I want only 2 records
my data
company name priority
a 10
a 1
a 3
b 2
b 4
b 3
b 5
c 1
c 10
c 2
my expected data
company name priority
a 1
a 3
b 2
b 3
c 1
c 2
Add a 'top 2' clause to the outer query:
select top 2 f.CompanyName, f.EmployeeCity, f.PrioritySL ,f.EmployeeSeniorityLevel ,f.EmployeeID
from (
select ConcatKey, min(PrioritySL) as PSL
from dbo.WalkerItContacts group by ConcatKey
) as x inner join dbo.WalkerItContacts as f on f.ConcatKey = x.ConcatKey and f.PrioritySL = x.PSL
where f.PrioritySL != '10'
and f.CompanyName= 'Apple'
will give you two rows. Add a order clause by in the outer query so you can control which two rows are returned.
You can phrase this more succinctly and with better performance as:
select top (2) wic.*
from (select wic,
rank() over (partition by CompanyName, ConcatKey order by PrioritySL) as seqnum
from dbo.WalkerItContacts wic
) wic
where seqnum = 1 and
wic.PrioritySL <> 10 and
wic.CompanyName = 'Apple';
I think you could solve your problem using the ROW_NUMBER() function to count the rows and filter it in the WHERE clause to only show 2 rows per group.
I think something like this might work for you:
SELECT rownum, f.CompanyName, f.EmployeeCity, f.PrioritySL,
f.EmployeeSeniorityLevel, f.EmployeeID
FROM ( SELECT ConcatKey, MIN(PrioritySL) AS PSL, ROW_NUMBER() OVER(PARTITION BY
f.CompanyName) AS rownum
FROM dbo.WalkerItContacts
GROUP BY ConcatKey) AS x
INNER JOIN dbo.WalkerItContacts AS f ON f.ConcatKey = x.ConcatKey
AND f.PrioritySL = x.PSL
WHERE f.PrioritySL != '10' AND rownum <= 2
ORDER BY f.CompanyName ASC;
Hope this helps some.
I have this query. There's a lot of joins because I am checking if an ID is linked to any of those tables.
Currently, this query shows me any ID's that are not linked to any of those tables. I would like to add to it so that it also shows any IDs that are linked to the d table, but only if there is only 1 row in the D table and the type in the D field is 'member'.
SELECT
c.ID,
c.location,
c.pb,
c.name,
c.surname
FROM c
LEFT JOIN l on c.rowno = l.rowno
LEFT JOIN d on c.rowno = d.rowno
LEFT JOIN t on c.rowno = t.rowno
LEFT JOIN cj ON (c.rowno = cj.rowno OR c.rowno = cj.rowno2)
LEFT JOIN dj ON c.rowno = d.rowno
LEFT JOIN lg ON c.rowno = lg.rowno
LEFT JOIN tj ON c.rowno = tj.rowno
WHERE
c.status != 'closed'
AND l.rowno IS NULL
AND d.rowno IS NULL
AND t.rowno IS NULL
AND cj.rowno IS NULL
AND dj.rowno IS NULL
AND lg.rowno IS NULL
AND tj.rowno IS NULL
My first thought is to just add
WHERE D.type = 'member'
But that gives me all IDs that have a row with D.type = member (they could have 10 rows with all different types, but as long as 1 of those has type = member it shows up). I want to see ID's that ONLY have d.type = member
I'm sorry if I'm wording this badly, I'm having trouble getting this straight in my head. Any help is appreciated!
I would use exists for all conditions except the one on the D table:
SELECT c.*
FROM c JOIN
(SELECT d.rownum, COUNT(*) as cnt,
SUM(CASE WHEN d.type = 'Member' THEN 1 ELSE 0 END) as num_members
FROM t
GROUP BY d.rownum
) d
ON c.rownum = d.rownum
WHERE c.status <> 'closed' AND
NOT EXISTS (SELECT 1 FROM t WHERE c.rowno = t.rowno) AND
NOT EXISTS (SELECT 1 FROM l WHERE c.rowno = l.rowno) AND
. . .
I find NOT EXISTS is easier to follow logically. I don't think there is a big performance difference between the two methods in SQL Server.
given these relationships, how could you query the following:
The tourists (name and email) that booked at least a pension whose rating is greater than 9, but didn't book any 3 star hotel with a rating less than 9.
Is the following correct?
SELECT Tourists.name, Tourists.email
FROM Tourists
WHERE EXISTS (
SELECT id FROM Bookings
INNER JOIN Tourists ON Bookings.touristId=Tourists.id
INNER JOIN AccomodationEstablishments ON Bookings.accEstId=AccomodationEstablishments.id
INNER JOIN AccomodationTypes ON AccomodationEstablishments.accType=AccomodationTypes.id
WHERE AccomodationTypes.name = 'Pension' AND
AccomodationEstablishments.rating > 9
) AND NOT EXISTS (
SELECT id FROM Bookings
INNER JOIN Tourists ON Bookings.touristId=Tourists.id
INNER JOIN AccomodationEstablishments ON Bookings.accEstId=AccomodationEstablishments.id
INNER JOIN AccomodationTypes ON AccomodationEstablishments.accType=AccomodationTypes.id
WHERE AccomodationTypes.name = 'Hotel' AND
AccomodationEstablishments.noOfStars = 3 AND
AccomodationEstablishments.rating < 9
)
I would do this using aggregation and having:
SELECT t.name, t.email
FROM Bookings b INNER JOIN
Tourists t
ON b.touristId = t.id INNER JOIN
AccomodationEstablishments ae
ON b.accEstId = ae.id INNER JOIN
AccomodationTypes a
ON ae.accType = a.id
GROUP BY t.name, t.email
HAVING SUM(CASE WHEN a.name = 'Pension' AND ae.rating > 9 THEN 1 ELSE 0 END) > 0 AND
SUM(a.name = 'Hotel' AND ae.noOfStars = 3 AND ae.rating < 9 THEN 1 ELSE 0 END)= 0;
Your method also works, but you probably need t.id in the subqueries.
I have two different sources of information and I am trying to marry them together to get information relating to a customer and their last bill. I have managed to get details of each customer and their max billing period end date but I am unsure as to how I can then get the details from the associated bill. I have the following query:
SELECT new_mprnnumber,
new_customernumber,
MAX(b.billingPeriodEndDate) as 'Billed up to date'
FROM [CRM].[crm4_MSCRM].[dbo].[AccountExtensionBase] as a
inner join Billing.dbo.bill as b
on a.new_mprnnumber = b.MPRN
where new_accountstage = 7
and new_accounttype = 2
group by new_mprnnumber,
new_customernumber
GO
The bill has fields like amount due etc but I only want to return details of those from the max dated bill, any help would be greatly appreciated
Use a CTE with row_number()
with CTE as
(
select a.new_mprnnumber,
a.new_customernumber,
b.*,
row_number()
over (partition by new_customernumber -- add additional partitions as you would group bys
order by billingPeriodEndDate desc) as r_ord
from AccountExtensionBase a
inner join bill b
on a.new_mprnnumber = b.MPRN
where new_accountstage = 7
and new_accounttype = 2
)
select *
from CTE
where r_ord = 1
Put your query into a CTE and then link back to table bill:
WITH CTE AS (
SELECT new_mprnnumber,
new_customernumber,
MAX(b.billingPeriodEndDate) as MaxBillDate
FROM [CRM].[crm4_MSCRM].[dbo].[AccountExtensionBase] as a
inner join Billing.dbo.bill as b
on a.new_mprnnumber = b.MPRN
where new_accountstage = 7
and new_accounttype = 2
group by new_mprnnumber,
new_customernumber
)
SELECT b.*
FROM CTE c
INNER JOIN Billing.dbo.bill b ON c.MaxBillDate = b.billingPeriodEndDate AND c.new_mprnnumber = b.MPRN
How can i retrieve the max of each ValueCount based on the firmid. I need the data to be output like so.
My code is below
SELECT
F.FirmID,
F.Name,
DL.ValueId,
DL.ValueName,
count(DL.ValueName) AS ValueCount
FROM
dbo.Jobs AS J
INNER JOIN DimensionValues AS DV ON
DV.CrossRef = J.JobId
INNER JOIN dbo.DimensionLists AS DL ON
DV.ValueId = DL.ValueId
INNER JOIN Firms AS F ON
F.FirmId = J.ClientFirmId
WHERE
DL.DimensionId = 4
GROUP BY
F.FirmID,
F.Name,
DL.ValueName,
DL.ValueId
this produces something like
firmid | value | count
1 1 5
1 2 10
2 3 1
2 1 6
i need to return back the records with 10 and 6.
EDIT : SQL 2005 answer deleted.
Then you could push your results into a temporary table (or table variable) and do something like this...
SELECT
*
FROM
TempTable
WHERE
ValueCount = (SELECT MAX(ValueCount) FROM TempTable AS Lookup WHERE FirmID = TempTable.FirmID)
Or...
SELECT
*
FROM
TempTable
INNER JOIN
(SELECT FirmID, MAX(ValueCount) AS ValueCount FROM TempTable GROUP BY FirmID) AS lookup
ON lookup.FirmID = TempTable.FirmID
AND lookup.ValueCount = TempTable.ValueCount
These will give multiple records if any ValueCount is tied with another for the same FirmID. As such, you could try this...
SELECT
*
FROM
TempTable
WHERE
value = (
SELECT TOP 1
value
FROM
TempTable as lookup
WHERE
FirmID = TempTable.FirmID
ORDER BY
ValueCount DESC
)
For this problem you need to produce the result set of the query in order to determine the Max ValueCount, then you need to do the query again to pull just the records with Max ValueCount. You can do this many way, like repeating the main query as subqueries, and in SQL Server 2005/2008 by using a CTE. I think using the subqueries gets a little messy and would prefer the CTE, but for SQL Server 2000 you don't have that as an option. So, I've used a temp table instead of a CTE. I run it once to get the MaxValueCount and save that into a temp table, then run the query again and join against the temp table to get just the record with MaxValueCount.
create table #tempMax
(
FirmID int,
MaxValueCount int
)
insert #tempMax
SELECT t.FirmID, MAX(t.ValueCount) AS MaxValueCount
FROM (
SELECT F.FirmID, F.Name, DL.ValueId, DL.ValueName
, count(DL.ValueName) AS ValueCount
FROM dbo.Jobs AS J
INNER JOIN DimensionValues AS DV ON DV.CrossRef = J.JobId
INNER JOIN dbo.DimensionLists AS DL ON DV.ValueId = DL.ValueId
INNER JOIN Firms AS F ON F.FirmId = J.ClientFirmId
WHERE DL.DimensionId = 4
GROUP BY F.FirmID, F.Name, DL.ValueName, DL.ValueId) t
SELECT t.FirmID, t.Name, t.ValueID, t.ValueName, t.ValueCount
FROM (
SELECT F.FirmID, F.Name, DL.ValueId, DL.ValueName
, count(DL.ValueName) AS ValueCount
FROM dbo.Jobs AS J
INNER JOIN DimensionValues AS DV ON DV.CrossRef = J.JobId
INNER JOIN dbo.DimensionLists AS DL ON DV.ValueId = DL.ValueId
INNER JOIN Firms AS F ON F.FirmId = J.ClientFirmId
WHERE DL.DimensionId = 4
GROUP BY F.FirmID, F.Name, DL.ValueName, DL.ValueId) t
INNER JOIN #tempMax m ON t.FirmID = m.FirmID and t.ValueCount = m.MaxValueCount
DROP TABLE #tempMax
You should be able to use a derived table for this:
SELECT F.FirmID,
F.Name,
DL.ValueId,
DL.ValueName,
T.ValueCount
FROM Jobs J
INNER JOIN DimensionValues DV
ON DV.Crossref = J.JobID
INNER JOIN DimensionList DL
ON DV.ValueID = DL.ValueID
INNER JOIN Firms F
ON F.FirmID = J.ClientFirmID
--derived table
INNER JOIN (SELECT FirmID, MAX(ValueName) ValueCount FROM DimensionList GROUP BY FirmID) T
ON T.FirmID = F.FirmID
WHERE DL.DimensionId = 4
TBL1 and TBL2 is your query:
SELECT *
FROM TBL1
WHERE
TBL1.ValueCount = (SELECT MAX(TBL2.ValueCount) FROM TBL2 WHERE TBL2.FIRMID = TBL1.FIRMID)