寫sql腳本實現，然后執行該腳本。
如test.sql 腳本編寫如下：
insert into B [(字段1,字段2,...)] select * from A where 條件=‘條件’;
delete from A where 條件=‘條件’;
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insert into user3 (username,age) select username,age from user2; 主鍵會從1(或原有的)開始
mysql> insert into user3 (username,age) select username,age from user2 where `username` = '小紅';
然后執行該test.sql腳本
mysql -u test -p123456 <test.sql