MySQL使用單獨的SELECT查詢從多個表插入表

Question

我有一個名為people_temp_1的表，其中包含：

Name          Age          PersonID
John          25           1
Jane          32           2
Chris         47           3

還有一個名為people_temp_2的名稱，其中包含由表1中的PersonID鏈接的其他信息：

ID          Profession          Location
1           Web Developer       Texas
2           Graphic Designer    North Carolina
3           Sales               California

我想創建一個稱為人員的新表，該表“合並”兩個表中的數據。 我現在的操作方式是：

INSERT INTO people(name, age, profession, location)
SELECT people_temp_1.name AS name,
people_temp_2.age AS age,
(SELECT people_temp_2.profession FROM people_temp_2 WHERE people_temp_2.id = people_temp_1.personId) AS profession,
(SELECT people_temp_2.location FROM people_temp_2 WHERE people_temp_2.id = people_temp_1.personId) AS location
FROM people_temp_1

如您所見，我在插入查詢中使用多個選擇查詢，以便通過personId獲取相關數據。 當我應該能夠以某種方式一次查詢people_temp_2表並使用其所有列時，執行多個選擇查詢似乎有點骯臟，但是我不知道該怎么做。

有沒有更好的方法來構造插入語句？

Answer 1

它是SQL的基本功能之一-利用加盟 。 在您的情況下，最好使用outer join people_temp1 ，這樣您就不會錯過people_temp1中沒有在people_temp2具有相應記錄的people_temp2 ：

insert into people(name, age, profession, location)
select
    p1.name,
    p1.age
    p2.profession,
    p2.location
from people_temp1 as p1
    left outer join people_temp2 as p2 on p2.id = p1.person_id

Answer 2

嘗試如下使用聯接語法

INSERT INTO people(name, age, profession, location)
SELECT p1.namename,
p2.age,
p2.profession,
p2.location
FROM people_temp_1 p1
JOIN people_temp_2 p2 on p2.id = p1.personId

有關mysql上連接的更多信息

Answer 3

使用JOIN 。

INSERT INTO people(name, age, profession, location)
SELECT t1.name, t1.age, t2.profession, t2.location
FROM people_temp_1 t1
INNER JOIN people_temp_2 t2
ON t1.personid = t2.id