SQL語句高級（七）——複製表a、b

1、複製表數據作條件查詢 mysql> select cno,avg(degree) from score group by cno; +--------+-------------+ | cno | avg(degree) | +--------+-------------+ | 3-105 | 71.6667 | | 3-245 | 89.2000 | | 6-116

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