摘要：http://www.cnblogs.com/mchina/archive/2013/04/15/3010418.html 阅读全文

摘要：update energylog set value=(a.value+c.value)/2from energylog as a, energylog as cwhere a.idvariable=energylog.idvariable and energylog.idvariable=c.id... 阅读全文

只有注册用户登录后才能阅读该文。