3 = log
2
8
2襯 3覯 螻燕覃 8 .
1 = log
2
2
2襯 1覯 螻燕覃 2螳 .
8 = log
2
2 + log
2
2 + log
2
2
log
2
2 + log
2
2 + log
2
2 = 2 * 2 * 2 螳 . 襦蠏碁ゼ 豬 覃 螻煙 . 讀, 襦蠏碁 螻煙 朱 一壱 蟆 伎.
讀, select sum(log(x)) from tableA 螳 蠍一.