将两个 SQL 表合并为替换？

Question

长话短说，我需要能够组合两个表（一个是前一个表的延续，但有一点重叠）。然后我需要将一列设置为主键，这意味着没有重复。当我尝试只使用 SQL Management Studio 中的导入向导并将一个表导入另一个表时，它只是将一个表中的所有数据添加到下一个表中。我需要找出某种方法或 SQL 命令，将新表中的所有数据导入旧表中，并将任何现有的重复数据替换为新表中的数据。

这样想，我有两张表，数据如下：

People_Old table
+------+--------+
| Name | Color  |
+------+--------+
| Mary | Blue   |
| Katy | Yellow |
| Jim  | Green  |
| John | Red    |
+------+--------+

People table
+------+--------+
| Name | Color  |
+------+--------+
| Jim  | Silver |
| John | Brown  |
| Greg | Purple |
| Liz  | Pink   |
+------+--------+

假设“名称”列是主键，我想将新“人物”表中的数据添加到旧“人物_旧”表中，但替换重叠数据，以免重复。在本例中，我希望最终的“People_Old”表为：

+------+--------+
| Name | Color  |
+------+--------+
| Mary | Blue   |
| Katy | Yellow |
| Jim  | Silver |
| John | Brown  |
| Greg | Purple |
| Liz  | Pink   |
+------+--------+

Answer 1

使用REPLACE 语句，类似于：

replace into people_old select * from people;

Answer 2

DROP TABLE IF EXISTS old;

CREATE TABLE old
(Name VARCHAR(12) NOT NULL PRIMARY KEY
,Color  VARCHAR(12) NOT NULL
);

INSERT INTO old VALUES
('Mary','Blue'),
('Katy','Yellow'),
('Jim','Green'),
('John','Red');

DROP TABLE IF EXISTS new;

CREATE TABLE new
(Name VARCHAR(12) NOT NULL PRIMARY KEY
,Color  VARCHAR(12) NOT NULL
);

INSERT INTO new VALUES
('Jim' ,'Silver'),
('John','Brown'),
('Greg','Purple'),
('Liz' ,'Pink');


SELECT * FROM old;
+------+--------+
| Name | Color  |
+------+--------+
| Mary | Blue   |
| Katy | Yellow |
| Jim  | Green  |
| John | Red    |
+------+--------+

SELECT * FROM new;
+------+--------+
| Name | Color  |
+------+--------+
| Jim  | Silver |
| John | Brown  |
| Greg | Purple |
| Liz  | Pink   |
+------+--------+

INSERT INTO old 
SELECT name
     , color 
  FROM new 
    ON DUPLICATE KEY UPDATE old.color = new.color;

SELECT * FROM old;
+------+--------+
| Name | Color  |
+------+--------+
| Mary | Blue   |
| Katy | Yellow |
| Jim  | Silver |
| John | Brown  |
| Greg | Purple |
| Liz  | Pink   |
+------+--------+
6 rows in set (0.00 sec)