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update first join sec on first.id = sec.id set first.num = sec.newnum
更新两张表
update first2 join sec2 on first2.id = sec2.id,
first3 join sec3 on first3.id = sec3.id
set first2.score = sec2.newscore,
first3.score = sec3.newscore
一下更新多个表,还不知道数量。。。sorry