根据主键，把一个表的字段赋值到另一张表
需求：根据userId 把user表的 username 和phone字段填充到score表中 update score,user set score.username = user.username , score.phone = user.phone where score.userId = user.userId
或者update score join user on score.userId=user.userId set score.username = user.username , score.phone = user.phone
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