是否应该将带有城市、州和邮政编码的邮件地址标准化?我目前只关注美国的地址,我在文章的底部显示了一个规范化的表和一个ERD,还有一个非规范化的表。请为你的回答提供合理的答案。谢谢CREATE TABLE IF NOT EXISTS states ( name VARCHAR(45) NULL DEFAULT NULL , INDEX states_name (name ASC) )
CREATE TABLE IF
我为客户端继承了一个应用程序,并一直在执行以下查询,该查询耗时187秒,搜索304 m表行,以便发回444行结果行。SELECT Business.name, Business.primary_city, Count(click.id) as clicks, Count(DISTINCT email_leads.parent_message_id) as tot_email_leads, Count(bc.business_id) as county_no, Count(br.b