delete 表达式
1:删除表hwTab里的货号为"093156"的货物
delete from hwTab where 货号='093156 '
2:删除表hwTab里的品牌带"狼"字的信息
delete from hwTab where 品牌 like '% 狼 %'
3:删除表hwTab里的品牌中最后一个字带"狼"字的信息
delete from hwTab where 品牌 like '% 狼'
4:删除表hwTab里的品牌中第一个字带"狼"字的信息
delete from hwTab where 品牌 like '%狼 %'
5:删除表hwTab所有信息
delete from hwTab