SQL Syntax to filter credit memos

I have a dilemma and I am trying to figure out to structure the script. Here is a sample data set.


There first table contains A/R documents which includes invoices and credit memos
The second table contain project accounting invoices.

The problem I have is that there are two types of credit memos. Credit memos that tie to project invoices and credit memos that do not.

Sample Data:
RM20101 Docnumber   docdate   docamount   doctype  
                  CD1000           03/31/15    1,000            7            
                  RMV 100-02    03/25/15  20,000           7
                  100-02             01/15/15  50,000           1

PA23100  Docnumber   docdate    docamount
                  100-02            01/15/15   50,000

So in this case doctype = 7 means credit memo and 1 means invoice
The dilemma is how to I structure the sql query so that it will only return the first doc CD1000? The second RMV 100-02 needs to be excluded because the 100-02 substring from the PA23100 table exists in the RM20101.DOCNUMBR. So what I am looking for are credit memos that only exist in the PM20101 table and are not project related (PA23100).
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Leo TorresSQL DeveloperCommented:

SELECT * FROM Sampletable st
				WHERE mt.SomeKey = st.SomeKey)

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dsackerContract ERP Admin/ConsultantCommented:
Wouldn't the third record also need to be excluded? If so, you might want to do your query as follows:
SELECT a.Docnumber, a.docdate, a.docamount, a.doctype
FROM   RM20101 a
ON     b.Docnumber = RIGHT(a.Docnumber, LEN(b.Docnumber))
WHERE  b.Docnumber IS NULL

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I'm joining on the assumption that the rightmost characters of RM20101.Docnumber are what you want to match against PA23100.Docnumber.
Mike EghtebasDatabase and Application DeveloperCommented:
create table #DOC (Docnumber varchar(15), docdate varchar(10), docamount int, doctype smallint);
create table #INV (Docnumber varchar(15), docdate varchar(10), docamount int);
insert into #DOC(Docnumber, docdate, docamount, doctype) values 
('CD1000','03/31/15', 1000, 7),
('RMV 100-02','03/25/15', 20000, 7),
('100-02','01/15/15', 50000, 1)

insert into #INV(Docnumber, docdate, docamount) values 
('100-02','01/15/15', 50000)

select * from #DOC;
select * from #INV;

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SELECT Docnumber, docdate, docamount, doctype 
From #DOC As D
Where Not Exists(Select * From #INV As I
       Where D.Docnumber like '%' + I.Docnumber)
       And doctype =7;

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This produces:
CD1000      03/31/15      1000      7

Here is your version of the code:
SELECT Docnumber, docdate, docamount 
From RM20101 As R
Where Not Exists(Select * From PA23100 As P
       Where R.Docnumber like '%' + P.Docnumber)
       And doctype =7;

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rwheeler23Author Commented:
Yes it does, I was so close. A fresh set of eyes is always helpful . Thank you!
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Microsoft SQL Server 2005

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