SQL Editor
Tables and Columns
Customer
- Id
(int)
- FirstName
(nvarchar)
- LastName
(nvarchar)
- City
(nvarchar)
- Country
(nvarchar)
- Phone
(nvarchar)
Order
- Id
(int)
- OrderDate
(datetime)
- OrderNumber
(nvarchar)
- CustomerId
(int)
- TotalAmount
(decimal)
OrderItem
- Id
(int)
- OrderId
(int)
- ProductId
(int)
- UnitPrice
(decimal)
- Quantity
(int)
Product
- Id
(int)
- ProductName
(nvarchar)
- SupplierId
(int)
- UnitPrice
(decimal)
- Package
(nvarchar)
- IsDiscontinued
(bit)
Supplier
- Id
(int)
- CompanyName
(nvarchar)
- ContactName
(nvarchar)
- ContactTitle
(nvarchar)
- City
(nvarchar)
- Country
(nvarchar)
- Phone
(nvarchar)
- Fax
(nvarchar)
Task:
List the duplicate rows as pairs below each other.
Click here
for details on
Duplicates
.
SELECT A.Id AS OrderId, FirstName, LastName, A.OrderNumber, A.OrderDate FROM [Order] A JOIN ( SELECT C.Id, FirstName, LastName, OrderDate, COUNT(O.Id) AS Occurences FROM [Order] O JOIN Customer C ON C.Id = O.CustomerId GROUP BY C.Id, OrderDate, FirstName, LastName HAVING COUNT(O.Id) > 1) AS B ON A.CustomerId = B.Id AND A.OrderDate = B.OrderDate
No records were found.
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in Austin, Texas. Vsn 1.3.0