say I have this:
select money from somewhere
I want now another column called accumulatedMoney which is going to be = to accumulatedMoney of previous row + money of current row
Ex:
m = 2, am = 2
m = 3, am = 5
m = 3, am = 8
...
What can I do to achieve this?
Thanks
In any database, you can do this with a correlated subquery:
select t.am, t.m,
(select sum(tprev.m) from t tprev where tprev.am <= t.am) as cumsum
from t
In any database, you can also do this as a join and group by:
select t.am, t.m, sum(tprev.m) as cumsum
from t join
t tprev
on tprev.am <= t.am
group by t.am, t.m
In databases that support cumulative sums, you can do it as:
select t.am, t.m,
sum(t.m) over (order by t.am) as cumsum
from t
(SQL Server 2012 and Oracle support this.)
Related
I am trying to figure out if there's a way to combine these 2 queries into a single one. I've run into the limits of what I know and can't figure out if this is possible or not.
This is the 1st query that gets last year sales for each day per location (for one month):
if object_id('tempdb..#LY_Data') is not null drop table #LY_Data
select
[LocationId] = ri.LocationId,
[LY_Date] = convert(date, ri.ReceiptDate),
[LY_Trans] = count(distinct ri.SalesReceiptId),
[LY_SoldQty] = convert(money, sum(ri.Qty)),
[LY_RetailAmount] = convert(money, sum(ri.ExtendedPrice)),
[LY_NetSalesAmount] = convert(money, sum(ri.ExtendedAmount))
into #LY_Data
from rpt.SalesReceiptItem ri
join #Location l
on ri.LocationId = l.Id
where ri.Ignored = 0
and ri.LineType = 1 /*Item*/
and ri.ReceiptDate between #_LYDateFrom and #_LYDateTo
group by
ri.LocationId,
ri.ReceiptDate
Then the 2nd query computes a ratio based on the total sales for that month for each day (to be used later):
if object_id('tempdb..#LY_Data2') is not null drop table #LY_Data2
select
[LocationId] = ly.LocationId,
[LY_Date] = ly.LY_Date,
[LY_Trans] = ly.LY_Trans,
[LY_RetailAmount] = ly.LY_RetailAmount,
[LY_NetSalesAmount] = ly.LY_NetSalesAmount,
[Ratio] = ly.LY_NetSalesAmount / t.MonthlySales
into #LY_Data2
from (
select
[LocationId] = ly.LocationId,
[MonthlySales] = sum(ly.LY_NetSalesAmount)
from #LY_Data ly
group by
ly.LocationId
) t
join #LY_Data ly
on t.LocationId = ly.LocationId
I've tried using the first query as a subquery in the 2nd query group-by from clause, but that won't let me select those columns in the outer most select statement (multi part identifier couldn't be bound).
As well as putting the first query into the join clause at the end of the 2nd query with the same issue.
There's probably something I'm missing, but I'm still pretty new to SQL so any help or just a pointer in the right direction would be greatly appreciated! :)
You can try using a Common Table Expression (CTE) and window function:
if object_id('tempdb..#LY_Data') is not null drop table #LY_Data
;with
cte AS
(
select
[LocationId] = ri.LocationId,
[LY_Date] = convert(date, ri.ReceiptDate),
[LY_Trans] = count(distinct ri.SalesReceiptId),
[LY_SoldQty] = convert(money, sum(ri.Qty)),
[LY_RetailAmount] = convert(money, sum(ri.ExtendedPrice)),
[LY_NetSalesAmount] = convert(money, sum(ri.ExtendedAmount))
from rpt.SalesReceiptItem ri
join #Location l
on ri.LocationId = l.Id
where ri.Ignored = 0
and ri.LineType = 1 /*Item*/
and ri.ReceiptDate between #_LYDateFrom and #_LYDateTo
group by
ri.LocationId,
ri.ReceiptDate
)
select
[LocationId] = cte.LocationId,
[LY_Date] = cte.LY_Date,
...
[Ratio] = cte.LY_NetSalesAmount / sum(cte.LY_NetSalesAmount) over (partition by cte.LocationId)
into #LY_Data
from cte
sum(cte.LY_NetSalesAmount) over (partition by cte.LocationId) gives you the sum for each locationId. The code assume that this sum is always non-zero. Otherwise, a divide-by-0 error will occur.
Seems like all you need to do is calculate ratio in the first query.
You can do this with a correlated subquery.
SELECT
...
convert(money, sum(ri.ExtendedAmount)/(SELECT sum(ri2.ExtendedAmount)
FROM rpt.SalesReceiptItem ri2
WHERE ri2.LocationId=ri.LocationId
)
) AS ratio --extended amount/total extended amount for this location
Is it possible to use COUNT in place of EXISTS?
I have following query:
SELECT *
FROM Goals G
WHERE EXISTS (SELECT NULL FROM tfv_home_last6(G.Date, G.Home) WHERE GameNumber <= 6 AND
HomeGoals >= 3)
Instead of returning the row if at least one row exists in the subquery, I'd like to specify a number of rows that need to be returned in the subquery, something like
SELECT *
FROM Goals G
WHERE ROWCOUNT(*) >= 2 (SELECT NULL FROM tfv_home_last6(G.Date, G.Home) WHERE GameNumber <= 6 AND
HomeGoals >= 3)
I'm not sure how to go about it?
I'm using SQL Server 2012.
You can do the subquery pretty much just like you describe:
SELECT *
FROM Goals G
WHERE (SELECT count(*)
FROM tfv_home_last6(G.Date, G.Home)
WHERE GameNumber <= 6 AND HomeGoals >= 3
) > 0;
However, this requires calculating the entire count. The exists form is more efficient, because it stops at the first matching record.
In SQL Server 2012, you could also use `cross apply:
SELECT *
FROM Goals G cross apply
(select count(*) as cnt
FROM tfv_home_last6(G.Date, G.Home)
WHERE GameNumber <= 6 AND HomeGoals >= 3
) a
WHERE a.cnt > 0;
I do not know which would have better performance, the correlated subquery in the where clause or the
cross apply version.
I need to use ROW_NUMBER() in the following Query to return rows 5 to 10 of the result. Can anyone please show me what I need to do? I've been trying to no avail. If anyone can help I'd really appreciate it.
SELECT *
FROM villa_data
INNER JOIN villa_prices
ON villa_prices.starRating = villa_data.starRating
WHERE villa_data.capacity >= 3
AND villa_data.bedrooms >= 1
AND villa_prices.period = 'lowSeason'
ORDER BY villa_prices.price,
villa_data.bedrooms,
villa_data.capacity
You need to stick it in a table expression to filter on ROW_NUMBER. You won't be able to use * as it will complain about the column name starRating appearing more than once so will need to list out the required columns explicitly. This is better practice anyway.
WITH CTE AS
(
SELECT /*TODO: List column names*/
ROW_NUMBER()
OVER (ORDER BY villa_prices.price,
villa_data.bedrooms,
villa_data.capacity) AS RN
FROM villa_data
INNER JOIN villa_prices
ON villa_prices.starRating = villa_data.starRating
WHERE villa_data.capacity >= 3
AND villa_data.bedrooms >= 1
AND villa_prices.period = 'lowSeason'
)
SELECT /*TODO: List column names*/
FROM CTE
WHERE RN BETWEEN 5 AND 10
ORDER BY RN
You can use a with clause. Please try the following
WITH t AS
(
SELECT villa_data.starRating,
villa_data.capacity,
villa_data.bedrooms,
villa_prices.period,
villa_prices.price,
ROW_NUMBER() OVER (ORDER BY villa_prices.price,
villa_data.bedrooms,
villa_data.capacity ) AS 'RowNumber'
FROM villa_data
INNER JOIN villa_prices
ON villa_prices.starRating = villa_data.starRating
WHERE villa_data.capacity >= 3
AND villa_data.bedrooms >= 1
AND villa_prices.period = 'lowSeason'
)
SELECT *
FROM t
WHERE RowNumber BETWEEN 5 AND 10;
I have a table with following values:
week_no amt amt_diff
1 500 100
2 600 300
3 900 100
4 1000 null
When I subtract week2.amt-week1.amt the difference is getting saved in the amt_diff column of week_no=1. But I want the result to be stored with the week_no=2 record.
Can anyone help me with the SQL?
I think this should work. You can make it a SELECT first to make sure you get the desired results. The syntax is valid in SQL Server, not sure about other RDBMS.
UPDATE m2
SET amt_diff = (m2.amt-m1.amt)
FROM MyTable m2
INNER JOIN MyTable m1
ON m1.week_no = (M2.week_no - 1)
It will update all records that have week after it to be calculated.
To just select the values:
SELECT amt_diff = (m2.amt-m1.amt)
FROM MyTable m2
INNER JOIN MyTable m1
ON m1.week_no = (M2.week_no - 1)
UPDATE YOURTABLE T
SET T.AMT_DIFF = ( T.AMT - NVL(( SELECT TT.AMT
FROM YOURTABLE TT
WHERE TT.WEEK_NO = (T.WEEK_NO - 1)
)
,0)
)
WHERE T.WEEK_NO = 2;
Might work for you.
update k
set k.amt_diff=(select k2.amt from week k2 where week_no=k.week_no+1)-amt
from week k
I have the following Syntax
select rcp.CalendarPeriodId
,rc.CalendarId
,rcp.CalendarYearId
,rcp.PeriodNumber
,rcp.PeriodStartDate,rcp.PeriodEndDate
,CASE WHEN GETDATE() BETWEEN rcp.PeriodStartDate AND rcp.PeriodEndDate THEN 1 ELSE 0 END AS 'CurrentPeriod'
from RentCalendarPeriod rcp
LEFT JOIN RentCalendarYear rcy ON rcy.CalenderYearId = rcp.CalendarYearId
LEFT JOIN RentCalendar rc ON rc.CalendarId = rcy.CalendarId
What this is doing is that a I have two Calendars (CalenderID 1 = Weekly, CalenderID 2 = Monthly) This is the RentCalendar table.
Each Rent Calendar has a Year (RentCalendarYear table),which in turn each Year has a set of periods.
You will notice that line 47, the final column has been marked as 1 (true) This is because it is the current period.
What I need to do is mark the previous 12 periods for any CalendarId. I was wondering if I could achieve this with ROW_NUMBER, with the field CurrentPeriod WHERE = 1 will be 1 and all periods before will start to be numbered 2, 3, 4, 5 and so on.
I don't know how to do this though.
So something like this:
SELECT * FROM (
select rcp.CalendarPeriodId,rc.CalendarId,rcp.CalendarYearId,rcp.PeriodNumber,rcp.PeriodStartDate,rcp.PeriodEndDate,
ROW_NUMBER() OVER(ORDER BY PeriodStartDate DESC) AS CurrentPeriod
from RentCalendarPeriod rcp
LEFT JOIN RentCalendarYear rcy ON rcy.CalenderYearId = rcp.CalendarYearId
LEFT JOIN RentCalendar rc ON rc.CalendarId = rcy.CalendarId)
WHERE currentperiod <= 12
I'm not sure if I understood you correctly.. this will give you for the latests week 1, second one 2 , third one 3 and so on in CurrentPeriod column
Something like this:
;WITH CTE AS (
SELECT rcp.CalendarPeriodId, rc.CalendarId, rcp.CalendarYearId,
rcp.PeriodNumber, rcp.PeriodStartDate, rcp.PeriodEndDate,
ROW_NUMBER() OVER (ORDER BY rcp.CalendarPeriodId) AS rn,
CASE
WHEN GETDATE() BETWEEN rcp.PeriodStartDate AND
rcp.PeriodEndDate THEN 1
ELSE 0
END AS 'CurrentPeriod'
FROM RentCalendarPeriod rcp
LEFT JOIN RentCalendarYear rcy ON rcy.CalenderYearId = rcp.CalendarYearId
LEFT JOIN RentCalendar rc ON rc.CalendarId = rcy.CalendarId
)
SELECT CalendarPeriodId, CalendarId, CalendarYearId,
PeriodNumber, PeriodStartDate, PeriodEndDate,
'CurrentPeriod',
(t.rn + 1) - c.rn AS rn
FROM CTE AS c
CROSS JOIN (SELECT rn FROM CTE WHERE 'CurrentPeriod' = 1) AS t
WHERE rn BETWEEN t.rn - 11 AND t.rn
This will return 12 records, the one having CurrentPeriod = 1 and the previous 11 records. Field rn enumerates records starting from the one having CurrentPeriod = 1.