传递2个参数并根据相关的2个表中的值更新表

Question

Microsoft sql 2008

以下三个表通过b = b和d = d相关联 我想查询3个表并使用表1中的声明集column1 = a更新表2 column3 = d中的值，并在表3中声明set column2 = f。一旦满足条件，更新表2 column3，其值为table3 column3

SELECT videos.id, count(*) video_comments 
FROM videos LEFT JOIN comments 
ON comments.comments_video_id = videos.id
GROUP BY videos.id
ORDER BY video_comments DESC

Answer 1

UPDATE table2 t2
  INNER JOIN table1 t1 ON t1.column2=t2.column2
  INNER JOIN table3 t3 ON t3.column3=t2.column3
SET t2.column3=t3.column3
WHERE t1.column1='a'
  AND t2.column2='f'

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