SQL语句高级（七）——复制表a、b

1、复制表数据作条件查询 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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