group by对已知的参数进行分类统计 子曰

列中有五类参数，分别为“未售”“已售”“大定”“小定”“保留”，要对每类参数包含的数据进行统计

关键sql语句：sum(case zhuangtai when '未售' then 1 else 0 end) as 未售

 

完整sql：

select project_name, 'zongshu'=count(*),sum(case zhuangtai when '未售' then 1 else 0 end) as 未售,sum(case zhuangtai when '已售' then 1 else 0 end) as 已售,sum(case zhuangtai when '大定' then 1 else 0 end) as 大定,sum(case zhuangtai when '小定' then 1 else 0 end) as 小定,sum(case zhuangtai when '保留' then 1 else 0 end) as 保留 from project_fj,project  where project.id=project_fj.project_id GROUP BY project_name