使用内部联接更新两个表

Question

我有两个表，一个是问题，另一个是回答。

问题表的字段为

question_id, question, type, answer_id. 

答案表的字段为

answer_id, question_id, comment, rating, doctor_id

现在我想更新答案属于doctor_id所在的问题。为此我试着写这个查询：

update question q 
set q.question = 'dmvvnnv',a.comment = 'covonfvk',a.rating = 5 
INNER JOIN answer a on q.answer_id = a.answer_id 
WHERE a.doctor_id = 8

但它给了我语法错误：

  

1064 - 您的SQL语法出错;检查与MySQL服务器版本对应的手册，以获得正确的语法   靠近＆＃39; INNER JOIN在q.answer_id = a.answer_id WHERE上回答a   a.doctor_id = 8＆＃39;在第1行

Answer 1

对于UPDATE语法不同的MySQL JOIN，SET部分应位于JOIN

之后

使用以下查询更新条目：

UPDATE question q
INNER JOIN answer a ON a.answer_id = q.answer_id
SET q.question = 'dmvvnnv'
    ,a.comment = 'covonfvk'
    ,a.rating = 5
WHERE a.doctor_id = 8

Answer 2

使用以下内容：

UPDATE question q INNER JOIN answer a on q.answer_id = a.answer_id 
SET q.question = 'dmvvnnv',a.comment = 'covonfvk',a.rating = 5
WHERE a.doctor_id = 8