I am putting together a query in SQL Server but having issues with the sub-query
I wish to use the max(loadid) and count the number of records the query returns.
So for example my last loadid is 400 and the amount of records with 400 is 2300, so I would my recor_count column should display 2300. I have tried various ways below but am getting errors.
select count (loadid)
from t1
where loadid = (select max(loadid) from t1) record_count;
(select top 1 LOADID, count(*)
from t1
group by loadid
order by count(*) desc) as Record_Count
Showing loadid and number of matching rows with the use of grouping, ordering by count and limiting the output to 1 row with top.
select top 1 loadid, count(*) as cnt
from t1
group by loadid
order by cnt desc
This may be easier to achieve with a window function in the inner query:
SELECT COUNT(*)
FROM (SELECT RANK() OVER (ORDER BY loadid DESC) AS rk
FROM t1) t
WHERE rk = 1
Another simplest way to achieve the result :
Set Nocount On;
Declare #Test Table
(
Id Int
)
Insert Into #Test(Id) Values
(397),(398),(399),(400)
Declare #Abc Table
(
Id Int
,Value Varchar(100)
)
INsert Into #Abc(Id,Value) Values
(398,'')
,(400,'')
,(397,'')
,(400,'')
,(400,'')
Select a.Id
,Count(a.Value) As RecordCount
From #Abc As a
Join
(
Select Max(t.Id) As Id
From #Test As t
) As v On a.Id = v.Id
Group By a.Id
Related
I have a table that contains duplicated ItemId. I am using CTE to remove the duplicate records and keep only single record for each item. I am able to successfully achieve this milestone using following Query:
Create procedure sp_SumSameItems
as
begin
with cte as (select a.Id,a.ItemId,Qty, QtyPrice,
ROW_NUMBER() OVER(PARTITION by ItemId ORDER BY Id) AS rn from tblTest a)
delete x from tblTest x Join cte On x.Id = cte.Id where cte.rn > 1
end
The actual problem is I want to Sum the Qty and QtyPrice before deleting duplicate records. Where should I add Sum function ?
Problem Illustration:
You can't use update with delete statement, you need to update before :
update t
set t.qty = (select sum(t1.qty) from table t1 where t1.itemid = t.itemid);
A CTE is valid for only one statement, so you will need to either run the cte twice, once summing and then deleting or you could put the result of CTE in a temp table and then use the temp table to sum and then delete records in the original table.
At first level, you have to update Qty and QtyPrice after that remove duplicate records.
Given Example:
CREATE PROCEDURE Sp_sumsameitems
AS
BEGIN
WITH cte1
AS (SELECT a.id,
a.itemid,
Sum(qty) Qty,
Sum(qtyprice)QtyPrice,
FROM tbltest a
GROUP BY a.id)
UPDATE x
SET x.qty = c.qty,
x.qtyprice = c.qtyprice
FROM tbltest x
JOIN cte1 c
ON x.id = cte.id
WITH cte
AS (SELECT a.id,
a.itemid,
qty,
qtyprice,
Row_number()
OVER(
partition BY itemid
ORDER BY id) AS rn
FROM tbltest a)
DELETE x
FROM tbltest x
JOIN cte
ON x.id = cte.id
WHERE cte.rn > 1
END
Combining some examples, I came up with the following query (fields and table names have been anonymised soI hope I didn't insert typos).
UPDATE destinationTable
SET destinationField = t2.value
FROM destinationTable t1
CROSS APPLY (
SELECT TOP 1 'SomeRequiredPrefix ' + sourceField as value
FROM #sourceTable
WHERE sourceField <> ''
ORDER BY NEWID()
) t2
Problem
Currently, all records get the same value into destinationField , value needs to be random and different. I'm probably missing something here.
Here's a possible solution. Using CTE's assign row numbers to both tables based on random order. Join the tables together using that rownumber and update the rows accordingly.
;WITH
dt AS
(SELECT *, ROW_NUMBER() OVER (ORDER BY NEWID()) AS RowNum
FROM dbo.destinationtable),
st AS
(SELECT *, ROW_NUMBER() OVER (ORDER BY NEWID()) AS RowNum
FROM dbo.#sourcetable)
UPDATE dt
SET dt.destinationfield = 'SomeRequiredPrefix ' + st.sourcefield
FROM dt
JOIN st ON dt.RowNum = st.RowNum
UPDATED SOLUTION
I used CROSS JOIN to get all possibilities since you have less rows in source table. Then assign random rownumbers and only take 1 row for each destination field.
;WITH cte
AS
(
SELECT *, ROW_NUMBER() OVER (PARTITION BY destinationfield ORDER BY NEWID()) AS Rownum
FROM destinationtable
CROSS JOIN #sourcetable
WHERE sourcefield <> ''
)
UPDATE cte
SET cte.destinationfield = 'SomeRequiredPrefix ' + sourcefield
WHERE cte.Rownum = 1
SELECT * FROM dbo.destinationtable
I have a large table (130 columns). It is a monthly dataset that is separated by month (jan,feb,mar,...). every month I get a small set of duplicate rows. I would like to remove one of the rows, it does not matter which row to be deleted.
This query seems to work ok when I only select the ID that I want to filter the dups on, but when I select everything "*" from the table I end up with all of the rows, dups included. My goal is to filter out the dups and insert the result set into a new table.
SELECT DISTINCT a.[ID]
FROM MonthlyLoan a
JOIN (SELECT COUNT(*) as Count, b.[ID]
FROM MonthlyLoan b
GROUP BY b.[ID])
AS b ON a.[ID] = b.[ID]
WHERE b.Count > 1
and effectiveDate = '01/31/2017'
Any help will be appreciated.
This will show you all duplicates per ID:
;WITH Duplicates AS
(
SELECT ID
rn = ROW_NUMBER() OVER (PARTITION BY ID ORDER BY ID)
FROM MonthlyLoan
)
SELECT ID,
rn
FROM Duplicates
WHERE rn > 1
Alternatively, you can set rn = 2 to find the immediate duplicate per ID.
Since your ID is dupped (A DUPPED ID!!!!)
all you need it to use the HAVING clause in your aggregate.
See the below example.
declare #tableA as table
(
ID int not null
)
insert into #tableA
values
(1),(2),(2),(3),(3),(3),(4),(5)
select ID, COUNT(*) as [Count]
from #tableA
group by ID
having COUNT(*) > 1
Result:
ID Count
----------- -----------
2 2
3 3
To insert the result into a #Temporary Table:
select ID, COUNT(*) as [Count]
into #temp
from #tableA
group by ID
having COUNT(*) > 1
select * from #temp
does anyone know how can I subtract top two rows from one column only using one id? Here's my sample query:
SELECT top 2 a.consumption,
coalesce(a.consumption -
(SELECT b.consumption
FROM tbl_t_billing b
WHERE b.id = a.id + 1), a.consumption) AS diff
FROM tbl_t_billing a
WHERE a.customerId = '5'
ORDER BY a.dateCreated DESC
I want to know how to get the difference between the top 2 rows using one id from the consumption column using the customerId #5. I've tried but I can't get the right query for that. Can somebody help me please? Thanks!
try this:
;with cte as
(
select consumption, customerId,
row_number() over (partiton by customerid order by datecreated desc) rn
from tbl_t_billing where customerId = '5'
)
select a.customerId, a.consumption,
coalesce((a.consumption - b.consumption), a.consumption) consumption_diff
from cte a left outer join cte b on a.rn + 1 = b.rn
where a.rn = 1
declare #tbl_t_billing table(consumption int, customerId int, datecreated datetime)
insert into #tbl_t_billing
values
(10,5,'20100101'),
(7,5,'20000101'),
(9,4,'20100101'),
(5,4,'20000101'),
(8,3,'20100101'),
(3,3,'20000101'),
(7,2,'20100101'),
(3,2,'20000101'),
(4,1,'20100101'),
(2,1,'20000101')
-- get the difference between the last two consumption values for each customerId
select
customerId,
sum(consumption) diff
from(
select
customerId,
consumption *
case row_number() over(partition by customerId order by datecreated desc)
when 1 then 1 when 2 then -1
end consumption
from #tbl_t_billing
) t
group by customerId
I have two columns:
namecode name
050125 chris
050125 tof
050125 tof
050130 chris
050131 tof
I want to group by namecode, and return only the name with the most number of occurrences. In this instance, the result would be
050125 tof
050130 chris
050131 tof
This is with SQL Server 2000
I usually use ROW_NUMBER() to achieve this. Not sure how it performs against various data sets, but we haven't had any performance issues as a result of using ROW_NUMBER.
The PARTITION BY clause specifies which value to "group" the row numbers by, and the ORDER BY clause specifies how the records within each "group" should be sorted. So partition the data set by NameCode, and get all records with a Row Number of 1 (that is, the first record in each partition, ordered by the ORDER BY clause).
SELECT
i.NameCode,
i.Name
FROM
(
SELECT
RowNumber = ROW_NUMBER() OVER (PARTITION BY t.NameCode ORDER BY t.Name),
t.NameCode,
t.Name
FROM
MyTable t
) i
WHERE
i.RowNumber = 1;
select distinct namecode
, (
select top 1 name from
(
select namecode, name, count(*)
from myTable i
where i.namecode = o.namecode
group by namecode, name
order by count(*) desc
) x
) as name
from myTable o
SELECT max_table.namecode, count_table2.name
FROM
(SELECT namecode, MAX(count_name) AS max_count
FROM
(SELECT namecode, name, COUNT(name) AS count_name
FROM mytable
GROUP BY namecode, name) AS count_table1
GROUP BY namecode) AS max_table
INNER JOIN
(SELECT namecode, COUNT(name) AS count_name, name
FROM mytable
GROUP BY namecode, name) count_table2
ON max_table.namecode = count_table2.namecode AND
count_table2.count_name = max_table.max_count
I did not try but this should work,
select top 1 t2.* from (
select namecode, count(*) count from temp
group by namecode) t1 join temp t2 on t1.namecode = t2.namecode
order by t1.count desc
Here are to examples that you could use but the temp table use is more efficient than the view, but was done on a small data sample. You would want to check your own statistics.
--Creating A View
GO
CREATE VIEW StateStoreSales AS
SELECT t.state,t.stor_id,t.stor_name,SUM(s.qty) 'TotalSales'
,ROW_NUMBER() OVER (PARTITION BY t.state ORDER BY SUM(s.qty) DESC) AS 'Rank'
FROM [dbo].[sales] s
JOIN [dbo].[stores] t ON (s.stor_id = t.stor_id)
GROUP BY t.state,t.stor_id,t.stor_name
GO
SELECT * FROM StateStoreSales
WHERE Rank <= 1
ORDER BY TotalSales Desc
DROP VIEW StateStoreSales
---Using a Temp Table
SELECT t.state,t.stor_id,t.stor_name,SUM(s.qty) 'TotalSales'
,ROW_NUMBER() OVER (PARTITION BY t.state ORDER BY SUM(s.qty) DESC) AS 'Rank' INTO #TEMP
FROM [dbo].[sales] s
JOIN [dbo].[stores] t ON (s.stor_id = t.stor_id)
GROUP BY t.state,t.stor_id,t.stor_name
SELECT * FROM #TEMP
WHERE Rank <= 1
ORDER BY TotalSales Desc
DROP TABLE #TEMP