根據與外鍵的連接更新列中的數據

Question

我有一個包含一些不正確數據的表，我想更正這些表。對於前 - 在'address_detail'表中，地址字段錯誤地以'null'作爲前綴而不是城市名稱。

id | city_id | address 
----------------------------- 
7 | 1 | null/Street39 
8 | 2 | null/Street40 
9 | 3 | null/Street41 
10 | 4 | null/Street42 

city table 

id | name 
--------------- 
1 | Mexico  
2 | New York 
3 | Washington  
4 | Los Angeles 

修正後，我希望數據如：

address_detail表

id | city_id | address 
------------------------------- 
7 | 1   | Mexico/Street39 
8 | 2   | New York/Street40 
9 | 3   | Washington/Street41 
10 | 4   | Los Angeles/Street42 

我嘗試下面的腳本，但給我的錯誤。

UPDATE 
    address_detail ad 
SET 
    ad.address = (CONCAT(SELECT name FROM city c WHERE c.id = ad.city_id, SUBSTRING(ad.address, 5))) 
WHERE 
    ad.address LIKE 'null/%' 

Answer 1

UPDATE 
    address_detail ad 
SET 
    ad.address = REPLACE(ad.address, 'null', (SELECT name FROM city c WHERE c.id = ad.city_id)) 
WHERE 
    ad.address LIKE 'null/%'