SQLServer 的case when语句使用实现统计

result_info  varchar(5) check(result_info in(‘win‘,‘lose‘))
);
//插入数据
insert into game_info values(‘2018-2-4‘,‘win‘),(‘2018-2-5‘,‘lose‘);

//查询语句
select date_info ,sum(case result_info when ‘win‘ then 1 else 0 end) as win,sum( case result_info when ‘lose‘ then 1 
else 0 end) as lose from game_info group by date_info order by date_info asc;

case  result_info 
    when  ‘win‘ then 1
    else  0
end

case when  result_info =‘win‘ then 1
    else 0
end

select  (case gender  when  1 then ‘男’ 
                                when  2   then  ‘女‘
                                 else  ‘其他’
              end) as gender from  Table1;