sqlserver select 查询字段if判断用法

SELECT TOP 1000 [id],
      case when group_id>1 then 'vip'
           else '普通会员'
           end
  FROM [YaleBaoV2].[dbo].[ylb_users]
 
 
  SELECT TOP 1000 [id],
      case group_id when 1 then '普通会员'
          when 3 then '代理商'
          when 4 then 'VIP用户'          
           end
  FROM [YaleBaoV2].[dbo].[ylb_users]