爲什麼distinct在這個sql查詢中不起作用？ - 複雜的查詢

Question

可能重複：
Distinct in SQL Server

我想選擇disctinct PokemonId變量，但它不工作

這裏查詢

select distinct top 36 
    tblFoundPokemonsOnRoutes.pokemonId,MonsterTotalStats, 
    MAX(maxLevel) as maxLevel, 
    Case Class WHEN 'Ancient' Then '9' 
     WHEN 'Legendary' Then '8' 
     WHEN 'Zenith' Then '7' 
     WHEN 'Emissary' Then '6' 
     WHEN 'Starter' Then '5' 
     WHEN 'Superior' Then '4' 
     WHEN 'Regular' Then '3' 
     ELSE Class 
    END as Result 
from 
    tblFoundPokemonsOnRoutes 
left join 
    tblPokedex on tblFoundPokemonsOnRoutes.pokemonId = tblPokedex.PokemonId 
where 
    tblFoundPokemonsOnRoutes.routeId in 
      (select routeId from tblRoutes where ZoneNumber = 1) 
group by 
    maxLevel, tblFoundPokemonsOnRoutes.pokemonId, MonsterTotalStats, Class 
order by 
    Result desc, MonsterTotalStats desc 

這裏返回的結果

非常感謝您的答案

Answer 1

你不應該在你的GroupBy條款MaxLevel。這樣做：

select distinct top 36 
    tblFoundPokemonsOnRoutes.pokemonId,MonsterTotalStats, 
    MAX(maxLevel) as maxLevel, 
    Case Class WHEN 'Ancient' Then '9' 
     WHEN 'Legendary' Then '8' 
     WHEN 'Zenith' Then '7' 
     WHEN 'Emissary' Then '6' 
     WHEN 'Starter' Then '5' 
     WHEN 'Superior' Then '4' 
     WHEN 'Regular' Then '3' 
     ELSE Class 
    END as Result 
from 
    tblFoundPokemonsOnRoutes 
left join 
    tblPokedex on tblFoundPokemonsOnRoutes.pokemonId = tblPokedex.PokemonId 
where 
    tblFoundPokemonsOnRoutes.routeId in 
      (select routeId from tblRoutes where ZoneNumber = 1) 
group by 
    tblFoundPokemonsOnRoutes.pokemonId, MonsterTotalStats, Class 
order by 
    Result desc, MonsterTotalStats desc