SQLite中的一个Query中的多个Select语句
发布时间:2020-12-12 23:43:15 所属栏目:百科 来源:网络整理
导读:是否可以在SQLite中的一个查询中运行多个select语句? 如: SELECT ( SELECT ChestGemEffects.Value,Effect.Name FROM ChestGemEffects INNER JOIN Effect ON ChestGemEffects.EffectId = Effect.Id INNER JOIN Gems ON ChestGemEffects.GemId = Gems.Id WHE
是否可以在SQLite中的一个查询中运行多个select语句?
如: SELECT ( SELECT ChestGemEffects.Value,Effect.Name FROM ChestGemEffects INNER JOIN Effect ON ChestGemEffects.EffectId = Effect.Id INNER JOIN Gems ON ChestGemEffects.GemId = Gems.Id WHERE ( Gems.[Key] = 'SG1' ) ) AS ChestEffects,( SELECT WeaponGemEffects.Value,Effect.Name FROM WeaponGemEffects INNER JOIN Effect ON WeaponGemEffects.EffectId = Effect.Id INNER JOIN Gems ON WeaponGemEffects.GemId = Gems.Id WHERE ( Gems.[Key] = 'SG1' ) ) AS WeaponEffects,( SELECT OthersGemEffects.Value,Effect.Name FROM OthersGemEffects INNER JOIN Effect ON OthersGemEffects.EffectId = Effect.Id INNER JOIN Gems ON OthersGemEffects.GemId = Gems.Id WHERE ( Gems.[Key] = 'SG1' ) ) AS OthersEffects; 它给了我错误: ‘执行查询时出错:只有一个结果允许作为表达式一部分的SELECT’ 我的表达式有问题还是SQLite不支持? 谢谢 必须在FROM子句中使用子查询的结果作为源表进行进一步查询:SELECT * FROM (SELECT ...),(SELECT ...) 但是,这将是一个cross join,这不是你想要的. 要只附加多个表(具有相同的列数),请使用UNION ALL: SELECT ChestGemEffects.Value,Effect.Name FROM ... ... UNION ALL SELECT WeaponGemEffects.Value,Effect.Name FROM ... ... (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |