在SQL中使用连接进行更新的正确语法是什么？

Question

我几分钟前发布了一个问题并得到了这个问题

update pf
set price_test = (p.PRICE * .6)
from product as p
inner join product_featured as pf on pf.product_id = p.product_id

这是我的数据库结构

产品表

product_id  int(11) NO  PRI NULL    auto_increment
model   varchar(64) NO      NULL    
sku varchar(64) NO      NULL    
location    varchar(128)    NO      NULL    
quantity    int(4)  NO      0   
stock_status_id int(11) NO      NULL    
image   varchar(255)    YES     NULL    
manufacturer_id int(11) NO      NULL    
shipping    int(1)  NO      1   
price   decimal(15,4)   NO      0.0000

product_featured表

 product_id int(11) NO  PRI 0   
 price_test decimal(15,2)   YES     NULL

但这是我的错误

编辑..

我需要这个为SQL工作.....

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'from product as p
inner join product_featured as pf on pf.product_id = p.product' at line 3

Answer 1

试试这个.

update product_featured pf
set price_test = (
  select p.PRICE * .6
  from product p
  where pf.product_id = p.product_id
)