MYSQL語法 - 具有條件的分組

Question

這是我當前的查詢工作正常但我需要它只返回quantity_to_spawn> 0當我添加一個where子句它給我一個無效的消息組。

我很高興在必要時提供更多信息，但我不確定此時是否必要。 它是我正在寫的游戲。

SELECT spawns.*, (quantity - COUNT(game_moblist.spawn_id)) AS quantity_to_spawn,mobs.*     
FROM spawns LEFT JOIN mobs USING (mob_id) LEFT JOIN game_moblist USING (spawn_id) GROUP BY 
spawn_id ORDER BY quantity_to_spawn DESC

Answer 1

嘗試加入一個having一個，而不是where

  SELECT spawns.*, (quantity - COUNT(game_moblist.spawn_id)) AS quantity_to_spawn,
  mobs.*     
  FROM spawns 
  LEFT JOIN mobs USING (mob_id) 
  LEFT JOIN game_moblist USING (spawn_id) 
  GROUP BY spawn_id 
  having quantity_to_spawn > 0
  ORDER BY quantity_to_spawn DESC