mysql五大子句中where和having两个过滤使用区别

1、having子句的作用和where类似，都是具有根据条件对数据进行过滤的作用，不同点在于having在group by之后，而where在group by之前，另外where是先过滤后聚合，having是先聚合后过滤

2、以mysql系统自带ecs_goods表为例，要求提取：索爱C702c'及其shop_price总和，分别用having和where求出同样的结果。

3、having查询方法：select goods_name,sum(shop_price) as price from ecs_goods group by goods_name having goods_name='索爱C702c'';

4、where查询方法：select goods_name,sum(shop_price) as price from ecs_goods where goods_name='索爱C702c';