Finding the minimum of two columns from two different rows in a SQL table

Tag: sql,sql-server,sql-view

I am working on a SQL View which returns difference of two columns and minimum value of two columns that belongs to two different rows of single table.

I was able to find the difference but was not able to return the minimum value of two columns

I have the following table

 id      Market  Grade       Term    BidVolume   Bid     Offer   OfferVolume
    1       Heavy   ABC         Jun14 1000     -19.5      -17         2500
    2       Heavy   ABC         Jul14 2000      -20      -17.5        1400 
    3       Sour    XYZ         Jun14 3000      -30       -17         2300  
    4       Sour    XYZ         Jul14 1500      -32       -27         2900

And I have the following SQL query and its results below

CREATE VIEW [dbo].[InferredBids] AS
WITH numbered AS
  ( SELECT id, product, grade, term, bid, offer, termid, bidVolume, offerVolume,
           row_number() OVER (Partition BY Product, Grade ORDER BY termid) i
   FROM dbo.CanadianCrudes) --select * from numbered
SELECT r1.id AS Id,
       r1.product + '/' + r1.grade AS Market,
       r1.term + '/' + r2.term AS Term,
       r1.Bid - r2.Offer [Bid], r1.Offer - r2.Bid [Offer]
FROM numbered r1
JOIN numbered r2 ON r1.product = r2.product
AND r1.grade = r2.grade
AND r1.termid+1=r2.termid
AND r1.i<r2.i
AND r1.term!=r2.term

And Results are as follows fro the above query

Market     Term          Bid                   Offer
Heavy/ABC  Jun14/Jul14   (-19.5-(-17.5))=-2    (-17-(-20))=3
Sour/XYZ  Jun14/Jul14    (-30-(-27))=-3        (-17-(-32))=15

But I am trying to include another 2 columns called BidVolume and OfferVolume and results should be something like following

Market     Term          BidVolume                  Bid                   Offer        OfferVolume     
 Heavy/ABC  Jun14/Jul14  Min(1000,1400)=1000    (-19.5-(-17.5))=-2     (-17-(-20))=3  Min(2500,2000)=2000
 Sour/XYZ  Jun14/Jul14    Min(3000,2900)=2900   (-30-(-27))=-3        (-17-(-32))=15   Min(2300,1500)=1500

What would be the best way to include them

Best How To :

Aggregate functions, such as MIN are for aggregating across multiple rows, and will not do what you expect here (as you've already found out). Instead, you should use a case to choose which table and column to show from. Yes, I mean "table" here because your two joined rows are coming from separate logical tables, aliased t1 and t2.

For example, for BidVolume:

case when r1.BidVolume < r2.OfferVolume then r1.BidVolume else r2.OfferVolume end

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