How to select item of customer , if customer is mentioned in customer item table .?

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i have two table first is item master table(Icode,ItemName,UOM) and second customer item tabel(CICode,CItemName,UOM,CustomerID,Icode), Now i want when i define customer in second talbe then second table item is display, if do not mentioned in second table then item pick from first table.

What I have tried:

select ItemMasterFile.Descriptionitem,Customeritem.Citem ,customeritem.CIname,Customer.CustomerName
from ItemMasterFile left Join customeritem on ItemMasterFile.CodeItem=customeritem.Citem
left join Customer on Customer.CustomerID=Customeritem.CustomerID


if Customer exist 
   join with Customeritem 
else 
  Join with ItemMasterFile

Posted 22-Apr-19 0:36am

akhter86

Updated 22-Apr-19 2:28am

v2

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RickZeeland · Answer 1 · 2019-04-22T02:29:00

Solution 1

Take a look a the LEFT JOIN example here: SQL LEFT JOIN Keyword[^]
In your case the query should look like this:

SELECT Customers.CustomerName, Orders.OrderID
FROM Customers
LEFT JOIN Orders
ON Customers.CustomerID=Orders.CustomerID
WHERE OrderID IS NOT NULL
ORDER BY Customers.CustomerName;

Posted 22-Apr-19 2:29am

RickZeeland

Updated 22-Apr-19 2:32am

v2