I have a database in which there are 13 different products, sold in 6 different countries.
Prices increase once a year.
Prices need to be calculated using a linear interpolation method. I have 21 different price and quantity increments for each product for each country for each year.
The user needs to be able to see how much an order would cost for any given value (as you would expect).
What the database needs to do (in English!) is to:
If there is a matching quantity from TblOrderDetail in the TblPrices,
use the price for the current product, country and year
if there isn't a matching quantity but the quantity required is greater than 1000 for one product (GT) and greater than 100 for every other product:
Find the highest quantity for the product, country and year (so, 1000 or 100, depending on the product), and calculate a pro-rated price. eg. If someone wanted 1500 of product GT for the UK for 2015, we'd look at the price for 1000 GT in the UK for 2015 and multiply it by 1.5. If 1800 were required, we'd multiply it by 1.8. I haven't been able to get this working yet as I'm looking at it alongside the formula for the next possibility...
If there isn't a matching quantity and the quantity required is less than 1000 for the product GT but 100 for the other products (this is the norm)...
Find the quantity and price for the increment directly below the quantity required by the user for the required product, country and year (let's call these quantitybelow and pricebelow)
Find the quantity and price for the increment directly above the quantity required by the user for the required product, country and year (let's call these quantityabove and priceabove)
Calculate the price for the required number of products for an account holder in a particular country for a given year using this formula.
ActualPrice: PriceBelow + ((PriceAbove - PriceBelow) * (The quantity required in the order detail - QuantityBelow) / (QuantityAbove - QuantityBelow))
I have spent days on this and have sought advice about this before but I am still getting very stuck.
The tables I've been working with to try and make this work are as follows:
TblAccount (primary key is AccountID, it also has a Country field which joins to the TblCountry.Code (primary key)
TblOrders (primary key is Order ID) which joins to TblAccount via the AccountID field; TblOrderDetail via the OrderID. This table also holds the OrderDate and Recipient ID which links to a person in TblContact - I don't need that here but will need it later to generate an invoice
TblOrderDetail (primary key is DetailID) which joins to TblOrders via OrderID field; TblProducts via ProductID field, and holds the Quantity required as well as the product
TblProducts (primary key is ProductCode) which as well as joining to TblOrderDetail, also joins to TblPrice via the Product field
TblPrices links to the TblProducts (as you have just read). I've also created an Alias for the TblCountry (CountryAliasForProductCode) so I can link it to the TblPrices to show the country link. I'm not sure if I needed to do this - it doesn't work if I do or I don't do it, so I seek guidance again here.
This is the code I've been trying to use (and failing) to get my price and quantity steps above and I hope to replicate it, making a couple of tweaks to get the steps below:
SELECT MIN(TblPrices.stepquantity) AS QuantityAbove, MIN(TblPrices.StepPrice) AS PriceAbove, TblOrders.OrderID, TblOrders.OldOrderID, TblOrders.AccountID, TblOrders.OrderDate, TblOrders.RecipientID, TblOrders.OrderStatus, TblOrderDetail.DetailID, TblOrderDetail.Product, TblOrderDetail.Quantity
FROM (TblCountry INNER JOIN ((TblAccount INNER JOIN TblOrders ON TblAccount.AccountID = TblOrders.AccountID) INNER JOIN (TblOrderDetail INNER JOIN TblProducts ON TblOrderDetail.Product = TblProducts.ProductCode) ON TblOrders.OrderID = TblOrderDetail.OrderID) ON TblCountry.Code = TblAccount.Country) INNER JOIN (TblCountry AS CountryAliasForProduct INNER JOIN TblPrices ON CountryAliasForProduct.Code = TblPrices.CountryCode) ON TblProducts.ProductCode = TblPrices.Product
WHERE (StepQuantity >= TblOrderDetails.Quantity)
AND (TblPrices.CountryCode = TblAccount.Country)
AND (TblOrderDetail.Product = TblPrices.Product)
AND (DATEPART('yyyy', TblPrices.DateEffective) = DATEPART('yyyy', TblOrders.OrderDate));
I've also tried...
I've even tried going back to basics and trying again to generate the steps below in 1 query, then try the steps above in another and finally, create the final calculation in another query.
This is what I have been trying to get my prices and quantities below:
SELECT Max(StepQuantity) AS quantity_below, Max(StepPrice) AS price_below, TblOrderDetails.Quantity, TblAccounts.Country
FROM
(TblProducts INNER JOIN TblPrices ON TblProducts.ProductCode = TblPrices.Product)
(TblOrderDetail INNER JOIN TblProducts ON TblOrderDetail.Product = TblProducts.ProductCode)
(TblOrders INNER JOIN TblOrderDetail ON TblOrders.OrderID = TblOrderDetail.OrderID)
(TblAccount INNER JOIN TblOrders ON TblAccount.AccountID = TblOrders.AccountID),
WHERE (((TblPrices.StepQuantity)<=(TblOrderDetail.Quantity)) AND ((TblPrices.CountryCode)=([TblAccounts].[country])) AND ((TblPrices.Product)=([TblOrderDetail].[product])) AND ((DatePart('yyyy',[TblPrices].[DateApplicable]))=(DatePart('yyyy',[TblOrders].[OrderDate]))));
You may be able to see glaring errors in this but I'm afraid I can't. I've tried re-jigging it and I'm getting nowhere.
I need to be able to tie the information in to the OrderDetail records as the price generated will need to be added to a financial transactions table as a debit amount and will show as an amount owing on statements.
I'm really not very good at SQL. I've read and worked though several self-study books and I have asked part of this question before; but I really am struggling with it. If anyone has any ideas on how to proceed, or even where I've gone wrong with my code, I'd be delighted, even if you tell me I shouldn't be using SQL. For the record, I originally posted this question on a different forum under Visual Basic. Responses from that forum brought me to SQL - however, anything that works would be good!
I've even tried, using Excel, concatenating the Year&Product&Country&Quantity to get a unique product code, interpolating the prices for every quantity between 1 and 1000 for each product, country and year and bringing them into a TblProductsAndPrices table. In Access, I created a query to concatenate the Year(of order date from tblOrders)&Product(of tblorderdetails)&Country(of tblAccount) in order to get the required product code for the order. Another query would find a price for me. However, any product code that doesn't appear on the list (such as where a quantity isn't listed in the tblProductsAndPrices as it is larger than the highest price increment) doesn't have a price.
If there was a workable solution to what I've just described that would generate a price for everything, then I'd be so pleased.
I'd really like to be able to generate an order for any quantity of any product for any account based in any country on any date and retrieve a price which will be used to "debit" a financial account in the database, who in a transaction history for an account and appear on statements. I'd also like to be able to do an ad-hoc price check on the spot.
Thank you very much for taking the time to read this. I really appreciate it. If you could offer any help or words of encouragement, I'd be very grateful.
Many thanks
Karen
Maybe no one thinks on an easy solution to the problem, since not all minds work in database thinking.
Easy solution: Create one view that gives all calculated values, not only the final one you need, each one as a column. Then you can use such view in a relation view and use on some rows one of the values and on other rows other values, etc.
How to think is simple, think in reverse order, instead of thinking "if that then I need to calculate such else I need this other", think as "I need "such" and I need "this other", both are columns of an intermediate view, then think on top level "if" that would be another view, such view will select the correct value ignoring the rest.
Never ever try to solve all in one step, that can be a really big headache.
Pros: You can isolate calculated values (needed or not), sql is much more easy to write and maintain.
Cons: Resources use is bigger than minimal, but most of times that extra calculated values does not represent a really big impact.
In terms of tutorial out there: Instead of a Top-Down method, use a Down-Top method.
Sometimes it is better (with your example) to calculate all three values (you write sentences on bold) ignoring the if part, and have all three possible values for your order and after that discard the ones not wanted, than trying to only calculate one.
Trying to calculate only one is thinking as a procedural programming, when working with databases most times one must get rid of such thinking and think as reverse, first do the most internal part of such procedural programming to have all data collected, then do the external selection of the procedural programing.
Note: If one of the values can not be calculated, just generate a Null.
I know it is hard to think on First in, last out (Down-Top) model, but it is great for things as the one you want.
Step1 (on specific view, or a join from one view per calculation):
Calculate column 1 as price for the current product, country and
year
Calculate column 2 as calculate a pro-rated price as if 1000
Calculate column 3 as calculate a pro-rated price as if 100
Calculate column 4 as etc
Calculate column N as etc
Step 2 (Another view, the one you want):
Calculate the if part, so you can choose adequate column from previous view (you can use immediately if or a calculated auxiliary field).
Hope you can follow theese way of thinking, I have solved a lot of things like that one (and more complex) thinking in that way, but it is not easy to think as that, needs an extra effort.
Related
I am trying to gather various KPI's for salespersons in multiple stores. The goal is to break down store performance into salesperson level.
I am facing an issue when trying to add a hitrate, as this is normally only by store. Number of quotes given / Visitors.
Even though it may not be 100% accurate I still wish to have the KPI by sales person. I am able to do this on a sales person level, but my subtotal for the store is incorrect, as it makes a summation of visitors by sales persons.
Monthly period is to be considered to as sales persons comes and goes throughout the period. Example of what I wish for a Subtotal for the measure "Vis". Store X 370 for month 1,2 & 3. For Store Y 395.
Vis measure = Visitor (Calculation i have tried but gives the wrong result for the store total for the period.)
I have tried various Calculate, Sum, max functions, but nothing seems to provide the result I need.
I hope that someone might be able to help me get along with this.
Example data tables is link as shown below:
enter image description here
Thanks in advance.
This sounds like a case where the HASONVALUE function would be useful.
The idea being that you would the result of that function in an if to determine if you are calculating at your sales person level or a the store level which should contain multiple salespersons. Thus you would have two different calculations, one for the sales person and store combination, and one for the Store level.
Example would be sometime like the following, in this example I am assuming you have a sales person table:
Measure:= IF( HASONEVALUE( Salesperson[Sales Person] ),
[Vis],
[Measure for subtotal]
)
[Measure for Subtotal] would just being the calculation that you want for your store total.
Of course if you filter to just a single sales person, then the totals for the store will just match that sales person.
I am discovering SQL as I have to build queries in my new company.I have understood the basic but here is where I am stuck, maybe you could help me figure this out :
I would like to mention a product as unprocurable if sellers rejected my orders twice. Tricky part I aggregate the furniture orders for all our local offices, therefore even though I sent my purchase order(s) to one unique seller (the one with the best offer at the moment) I might have multiple lines for each item (one per office)
See below table for purchase orders, see REF1 item should be set as unprocurable as both on 21 and 31 december my orders have been rejected (no matter the seller)
http://i.stack.imgur.com/r3W3E.jpg
So to put it in logic I would like to have something like this:
For each items with 2 latest purchase orders that were both made at different dates and rejected(0 value in the table) THEN attach a note to it saying "unprocurable" else put as procurable.
IF it was only 1 value I think I could go with
Select
item
, MAX(date)
, case
when confirmed_units = 0
then 'Unprocurable'
else 'procurable'
end
From
purchase_table
Where
date between TO_DATE('01/01/2013', 'MM/DD/YYYY') AND TO_DATE('{RUN_DATE_YYYY/MM/DD}', 'YYYY/MM/DD')
But now I need to check the two latest purchase orders and that are not from the same day.
I am a bit lost, could you give a hand please?
Thanks !
Your question is a little unclear... have you tried using something along the lines of:
SELECT TOP 2 etc, etc... order by [column]
My background in SQL is limited, but my Googling isn't, I feel that I might just be missing the vocabulary to ask this question properly so hopefully beyond an answer to my question I can get the vocabulary I need to research this issue further.
I have a parts table - PARTS
I have a Purchase Order table - PO
and I have a PO Line Item table - PO_LINEITEM
The question I'm attempting to answer is given a particular part I want to get the latest purchase order and then look at the price we paid.
The PO table holds the date (PO_DATE) of when the Purchase Order was filled and the PO_LINEITEM table holds the information regarding the particular line item such as part primary key (PART_PRIMARYKEY) and price (PART_PRICE). The PARTS table isn't as important as the rest except that I need to return a PART primary key so that I can base the resulting view off the PARTS table
I've been through sub-queries and scalable sub-queries and the like, but I can't seem to find the right combination.
I started from a base of:
SELECT a.PO_DATE, b.PART_PRIMARYKEY, b.PART_PRICE
FROM PO a, PO_LINEITEM b
WHERE a.PO_PRIMARYKEY = b.PO_PRIMARYKEY
As you would expect this returns a list of every instance of an object in a PO with it's price and the date the Purchase Order was filled. The closest I have come to crack this is by using the MAX function on the date such as:
SELECT MAX(a.PO_DATE) AS DATE, b.PART_PRIMARYKEY, b.PART_PRICE
FROM PO a, PO_LINEITEM b
WHERE a.PO_PRIMARYKEY = b.PO_PRIMARYKEY
GROUP BY b.PART_PRIMARYKEY, b.PART_PRICE
This returns a Max date for each price a we paid for a particular part, so:
PART 1234, £12.95, 12/08/2012
PART 1234, £13.00, 14/08/2012
PART 1234. £11.15, 17/08/2012
PART 2345, £5.25, 12/08/2012
PART 2345, £5.65, 13/08/2012
etc.
What I need is:
PART 1234, £11.15, 17/08/2012
PART 2345. £5.65, 13/08/2012
If I could just group by the PART_PRIMARYKEY that would be excellent, but I get an ORA-00979 not a GROUP BY expression when I try.
Like I said I feel that my lack of vocabulary around this issue is impeding me finding an answer, so if anyone could point me in the right direction I'd be grateful
So hopefully I'm not asking a question that is asked every other day, but haven't found because I didn't use the magical combination of words to find.
Thank you for any help you can offer.
Look up Analytic Functions. They were introduced in 8i though I'm not sure how advanced they were at the time compared to how very good they can be in 11. A few links that I've used to understand them:
http://www.oracle-base.com/articles/misc/analytic-functions.php
http://www.orafaq.com/node/55
Though, a sub-query such as this might suffice (I may have your column naming mixed up):
select A.PART_PRIMARYKEY, B.PART_PRICE, A.PO_DATE
from PO A, PO_LINEITEM B
where A.PO_PRIMARYKEY = B.PO_PRIMARYKEY
and (A.PART_PRIMARYKEY, A.PO_DATE) in
( select A.PART_PRIMARYKEY, max(A.PO_DATE)
from PO A, PO_LINEITEM B
where A.PO_PRIMARYKEY = B.PO_PRIMARYKEY
group by A.PART_PRIMARYKEY);
I have a query that gives a product sales report by whatever date range I specify.
Something like select whatever from wherever where date ordered between start date and end date order by product id.
My page then loop through the recordset and displays the results on the page in a list.
What I would like to do is provide a list showing PRODUCT A total sales = whatever, PRODUCT B total sales = whatever so on and so forth. So as the loop runs product a = product a + 1
I do this already with staff sales, but there are only 5 staff so I have managed to do this, but there are over 300 product codes.
What is the best way to proceed.
Possible solutions:
Do this in your application code by keeping track of the product code and running totals. When the product code changes, emit an extra row with the totals into the output.
Do something similar to #1, but use a separate GROUP BY query to get the totals.
Create a SELECT statement that UNIONs together two queries, one for the product detail lines and one with the summary information.
Use some product specific command (you don't say what database you're using) to accomplish #3 without having to do the UNION yourself. Both MySQL and SQL Server offer (different) ROLL UP clauses that can do what you want.
So, I figure I could probably come up with some wacky solution, but i figure i might as well ask up front.
each user can have many orders.
each desk can have many orders.
each order has maximum 3 items in it.
trying to set things up so a user can create an order and the order auto generates a reference number and each item has a reference letter. reference number is 0-99 and loops back around to 0 once it hits 99, so orders throughout the day are easy to reference for the desks.
So, user places an order for desk #2 of 3 items:
78A: red stapler
78B: pencils
78C: a kangaroo foot
not sure if this would be done in the program logic or done at the SQL level somehow.
was thinking something like neworder = order.last + 1 and somehow tying that into a range on order create. pretty fuzzy on specifics.
Without knowing the answer to my comment above, I will assume you want to have the full audit stored, rather than wiping historic records; as such the 78A 78B 78C type orders are just a display format.
If you have a single Order table (containing your OrderId, UserId, DeskId, times and any other top-level stuff) and an OrderItem table (containing your OrderItemId, OrderId, LineItemId -- showing 1,2 or 3 for your first and optional second and third line items in the order, and ProductId) and a Product table (ProductId, Name, Description)
then this is quite simple (thankfully) using the modulo operator, which gives the remainder of a division, allowing you in this case to count in groups of 3 and 100 (or any other number you wish).
Just do something like the following:
(you will want to join the items into a single column, I have just kept them distinct so that you can see how they work)
Obviously join/query/filter on user, desk and product tables as appropriate
select
o.OrderId,
o.UserId,
o.DeskId
o.OrderId%100 + 1 as OrderNumber,
case when LineItem%3 = 1 then 'A'
when LineItem%3 = 2 then 'B'
when LineItem%3 = 0 then 'C'
end as ItemLetter,
oi.ProductId
from tb_Order o inner join tb_OrderItem oi on o.OrderId=oi.OrderId
Alternatively, you can add the itemLetter (A,B,C) and/or the OrderNumber (1-100) as computed (and persisted) columns on the tables themselves, so that they are calculated once when inserted, rather than recalculating/formatting when they are selected.
This sort-of breaks some best practice that you store the raw data in the DB and you format on retrieval; but if you are not going to update the data and you are going to select the data for more than you are going to write the data; then I would break this rule and calculate your formatting at insert time