如何在表中查找重复的名称

Question

我有一张有人名地址和职位的表。 名字有时会重复。我必须比较两个人是否有相同的名字和相同的地址，而不是只保留1个记录。

Table: Data_Excel
Name: P_Name
Address: P_Address
City:  P_city

Answer 1

要查找重复项，您可以执行以下操作：

SELECT P_name,
  P_Address,
  P_city
FROM Data_Excel
GROUP BY P_Name,
  P_Address,
  P_city
HAVING COUNT(*) > 1;

要删除重复项，您可以执行以下操作：

DELETE
FROM Data_Excel
WHERE rowid NOT IN (
    SELECT MIN(rowid)
    FROM Data_Excel
    GROUP BY P_Name,
      P_Address,
      P_city
    );

要插入人员表，您可以执行以下操作：

INSERT INTO Person(id,name)
SELECT (SELECT MAX(id)+1 FROM Person),P_Name 
FROM Data_Excel WHERE P_Name NOT IN (SELECT name FROM Person)

Answer 2

SELECT P_Name,P_Address,count(*)
FROM Data_Excel
GROUP BY P_Name,P_Address
HAVING count(*) > 1;

这将为您提供相同P_Name＆amp;的记录。 P_Address。