sql - 将 SQLite 语句移植到 Firebird

Question

我有这个 select 语句在 SQLite 中完美运行:

SELECT extra, count(extra) AS total FROM (SELECT itemID, item, note, sourceItemID, title, collectionName, tagID, modalityID, extra FROM items INNER JOIN factors ON items.itemID = factors.zotero_itemID WHERE collectionID = :collectionID AND (tagID = 4 OR tagID = 1) GROUP BY item) GROUP BY extra

但是当我尝试在 Firebird 上运行它时，我收到此错误消息:

Dynamic SQL Error.
SQL error code = -104.
Invalid expression in the select list (not contained in either an aggregate function or the GROUP BY clause).

请问有人可以告诉我发生了什么事吗？ 最好的问候

Answer 1

SELECT extra, count(extra) AS total 
FROM (SELECT extra 
      FROM items 
      INNER JOIN factors ON items.itemID = factors.zotero_itemID 
      WHERE collectionID = :collectionID 
      AND (tagID = 4 OR tagID = 1) 
      ) t
GROUP BY extra

如果您只需要从内部查询中计数 额外，最好不要选择其他查询并按它们分组，因为您无论如何都不使用聚合函数(在内部查询中)。