Table join question

Here is some sample data from 2 sql server 2008 tables

CustomerOrderNew
CustomerID   OrderDate      OrderAmount
1                      04/01/2018   400
2                      04/01/2018   666
3                      04/20/2018   787

CustomerOrderOld
CustomerID   OrderDate      OrderAmount
1                      04/01/2018   250
1                      04/11/2018   45
5                     05/01/2018   1000


Trying to write a query that will return rows from both tables.  The “catch” is  if there is an entry in CustomerOrderOld with a matching customerid and orderdate in CustomerOrderNew, I do not want to return it

Given the sample data above I would like the output to be
CustomerID   OrderDate      OrderAmount
1                      04/01/2018   400              
2                      04/01/2018   666
1                      04/11/2018   45
3                      04/20/2018   787
5                     05/01/2018   1000
johnnyg123Asked:
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Scott PletcherSenior DBACommented:
SELECT CustomerID, OrderDate, OrderAmount
FROM CustomerOrderNew
UNION ALL
SELECT CustomerID, OrderDate, OrderAmount
FROM CustomerOrderOld coo
WHERE NOT EXISTS(
    SELECT 1
    FROM CustomerOrderNew con
    WHERE con.CustomerID = coo.CustomerID AND
        con.OrderDate = con.OrderDate
    )
johnnyg123Author Commented:
hey scott

Thanks so much for the post!

I get the following
CustomerID      OrderDate      OrderAmount
1      2018-04-01      400
2      2018-04-01      666
3      2018-04-20      787


I reread my question and I apologize for not making it clear that I want the unmatched entries from customerorderold as well
just wanted to skip any matching entries with same customerid and orderdate

Given the sample data above I would like the output to be
 CustomerID   OrderDate      OrderAmount
 1                      04/01/2018   400              
 2                      04/01/2018   666
 1                      04/11/2018   45
 3                      04/20/2018   787
 5                     05/01/2018   1000

Thanks!
Scott PletcherSenior DBACommented:
That's what I was trying to do.  Without any usable sample data, I wasn't able to test my code.  Us experts are already volunteering our time to help you, it seems a bit much that we also have to build the test data too(!).  But I'll go ahead and create usable data myself:

CREATE TABLE #CustomerOrderNew (
    CustomerID int NOT NULL,
    OrderDate date NOT NULL,
    OrderAmount int NOT NULL
);
INSERT INTO #CustomerOrderNew VALUES
(1,                    '04/01/2018', 400),
(2 ,                   '04/01/2018', 666),
(3  ,                  '04/20/2018', 787)


CREATE TABLE #CustomerOrderOld (
    CustomerID int NOT NULL,
    OrderDate date NOT NULL,
    OrderAmount int NOT NULL
);
INSERT INTO #CustomerOrderOld VALUES
(1 ,                     '04/01/2018' ,  250),
(1  ,                    '04/11/2018',   45),
(5   ,                  '05/01/2018',   1000)
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Scott PletcherSenior DBACommented:
Typo in the EXISTS query, wrong alias.  Here's a corrected version:

SELECT CustomerID, OrderDate, OrderAmount
FROM #CustomerOrderNew
UNION ALL
SELECT CustomerID, OrderDate, OrderAmount
FROM #CustomerOrderOld coo
WHERE NOT EXISTS (
    SELECT 1
    FROM #CustomerOrderNew con
    WHERE con.CustomerID = coo.CustomerID AND
        con.OrderDate = coo.OrderDate
    )

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HuaMin ChenProblem resolverCommented:
Try

select * from customerordernew new
Where not exists(select * from customerorderold old
Where old.customerid=new.customerid
And old.orderdate=new. orderdate)

Open in new window

johnnyg123Author Commented:
Thanks Scott!  Appreciate the help

Point taken on the data.  my bad
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