SQL: Join table onto itself

Question

I'm given a list of transportation lanes with a dollar amount per lane. The problem is that sometimes an indirect route is cheaper than the direct route. I want to be able to find those instances and insert them into a new table. I've tried using a LEFT OUTER JOIN but I can't quite figure it out. Below is an example of what I'm looking for and the code I tried. I'm not sure what database it is.

(Edit) Example: Cost from loc. 0380 to loc. 1428 (direct) is $100.00 but cost from 0380 to 1732 and then 1428 (indirect) is $99.61.

Org | Dest | Amount

0380 | 1428 | $100.00

0380 | 1732 | $92.26

1732 | 1428 | $7.35

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INSERT INTO dbo.NewTable 
SELECT T1.Org, T1.Dest, T1.Amount, T2.Org, T2.Dest, T2.Amount, T3.Org, T3.Dest, T3.Amount
FROM (( dbo.RateTable [T1] 
    LEFT OUTER JOIN dbo.RateTable [T2] 
        ON T1.Org = T2.Org) 
    LEFT OUTER JOIN dbo.RateTable [T3] 
        ON T1.Dest = T3.Dest AND T2.Dest = T3.Dest)
WHERE T1.Amount > (T2.Amount + T3.Amount);

Answer 1

I think the only change that needs to be made is in the last join condition:

SELECT T1.Org, T1.Dest, T1.Amount, T2.Org, T2.Dest, T2.Amount, T3.Org, T3.Dest, T3.Amount
FROM dbo.RateTable T1 JOIN
     dbo.RateTable T2
     ON T1.Org = T2.Org JOIN
     dbo.RateTable T3 
     ON T1.Dest = T3.Dest AND T2.Dest = T3.Org
----------------------------------------^
WHERE T1.Amount > (T2.Amount + T3.Amount);

Note that I changed the left outer join to regular inner joins. The where condition requires matches.

This is assuming that "Org" standard for "Origin" or something like that.

Answer 2

How about the following simple selection? Can it be simplified as such where the calcamount is the calculated amount you need. Select (CASE WHEN CalcAmount1 > CalcAmount2 THEN Amount1 ELSE Amount2 END) from Table