Question

我有以下查询..现在我必须检查相同的列是否有相同的数据..

任何人都可以帮我查询pls

SELECT 
   FirstName, MiddleName, LastName, Company, TaxExempt, 
   AddressTitle, AddressLine1, AddressLine2, City, [State], ZipCode, Country,
   PhoneNumber, EmailID, 
   o.OrderNumber, o.PONumber
FROM 
   CustomerAddresses ca 
    JOIN Orders o 
         ON ca.CustomerID = o.CustomerID
WHERE 
   AddressTitle='Billing'

Answer 1

一个常见的技巧是按所有内容进行分组并计算：

SELECT count(1) as [Count],
   FirstName, MiddleName, LastName, Company, TaxExempt, 
   AddressTitle, AddressLine1, AddressLine2, City, [State], ZipCode, Country,
   PhoneNumber, EmailID, 
   o.OrderNumber, o.PONumber
FROM 
   CustomerAddresses ca 
    JOIN Orders o 
         ON ca.CustomerID = o.CustomerID
WHERE 
   AddressTitle='Billing'
group by 
   FirstName, MiddleName, LastName, Company, TaxExempt, 
   AddressTitle, AddressLine1, AddressLine2, City, [State], ZipCode, Country,
   PhoneNumber, EmailID, 
   o.OrderNumber, o.PONumber

您可以添加：

having count(1) > 1

如果你只关心副本并且不想看单打，那么

在底部。

Answer 2

使用Common Table Expressions查找对其进行分组的所有行产生的计数大于1。然后将该结果连接回CustomerAddress表以获取每个地址的ID。

WITH Billing_CTE
  (SELECT FirstName, MiddleName, LastName, Company, TaxExempt, AddressTitle, AddressLine1, AddressLine2, City, [State], ZipCode, Country, PhoneNumber, EmailID, o.OrderNumber, o.PONumber, Count(1) AS [DupCount]
   FROM CustomerAddresses ca
   JOIN Orders o ON ca.CustomerID = o.CustomerID
   WHERE AddressTitle='Billing'
   GROUP BY FirstName, MiddleName, LastName, Company, TaxExempt, AddressTitle, AddressLine1, AddressLine2, City, [State], ZipCode, Country, PhoneNumber, EmailID, o.OrderNumber, o.PONumber HAVING Count(1) > 1)
SELECT ca.CustomerId,
       o.OrderNumber,
       o.PONumber
FROM Billing_CTE b
JOIN Oderers o ON b.OrderNumber = o.OrderNumber
AND b.PONumber = o.PONumber

如何检查SQL Server中的表中是否有2行具有相同的数据？

2 个答案: