mysql sqlserver下更新多表的区别
mysql 下:
update VideoFrequency , VideoFrequencyLibrary
set VideoFrequency. resourceUrl = VideoFrequencyLibrary.Url
where
?VideoFrequency.id = VideoFrequencyLibrary.videoId
and
length(resourceUrl) < 1
sqlserver下:
?
update VideoFrequency
set VideoFrequency. resourceUrl = VideoFrequencyLibrary.Url
from? VideoFrequency, VideoFrequencyLibrary
where
?VideoFrequency.id = VideoFrequencyLibrary.videoId
and
length(resourceUrl) < 1
?
?
?
?
