Question

我在hsql中有一个CREATE VIEW查询，但每当我运行它时，它都会抛出这个错误：

表达式不在聚合或GROUP BY列中：AGV.ID

我知道如果没有任何聚合表达式（AVG，SUM，MIN，MAX），GROUP BY将无法工作，但我无法弄清楚如何修复我的查询。因为每条记录都需要按manifestID值进行分组。

基本上，我试图通过组合3组选择查询来创建VIEW。

我尝试使用不同但没有运气，因为如果我有多个选定列，它将无效。此查询在MYSQL中正常工作。

我的查询：

CREATE VIEW local_view_event_manifest(
        manifest_id,
        eventId, 
        eventType, 
        eventDate,
        manifestID, 
        businessStepStr, 
        manifestVersion,
        externalLocation, 
        remark, 
        epcCode, 
        locationCode
        )
        AS
        SELECT 
        agm.manifest_id AS manifest_id,
        agv.id AS eventId,
        'AGGREGATION_EVENT' AS eventType,
        agv.event_time AS eventDate,
        md.manifest_id AS manifestID,
        agv.business_step_code AS businessStepStr,
        md.manifest_version AS manifestVersion,
        md.external_location AS externalLocation,
        md.remark AS remark,
        epc.code as epcCode,
        bloc.location_code as locationCode
        FROM 
        "local".local_MANIFEST_DATA AS md,
        "local".local_AGGREGATION_EVENT AS agv,
        "local".local_AGGREGATION_EVENT_EPCS AS agv_epc,
        "local".local_EPC AS epc,
        "local".local_BUSINESS_LOCATION AS bloc,
        "local".local_AGGREGATION_EVENT_MANIFEST_DATA AS agm
        WHERE
        md.id=agm.manifest_id
        AND agv.deleted=0
        AND md.deleted=0
        AND agv.id=agm.aggregation_event_id
        AND agv.id=agv_epc.aggregation_event_id
        AND agv.business_location_id=bloc.id
        AND bloc.id=agv.business_location_id
        AND agv_epc.epc_id=epc.id
        GROUP BY agm.manifest_id

        UNION
        SELECT 
        om.manifest_id AS manifest_id,
        ov.id AS eventId,
        'OBJECT_EVENT' AS eventType,
        ov.event_time AS eventDate,
        md.manifest_id AS manifestID,
        ov.business_step_code AS businessStepStr,
        md.manifest_version AS manifestVersion,
        md.external_location AS externalLocation,
        md.remark AS remark,
        epc.code as epcCode,
        bloc.location_code as locationCode
        FROM 
        "local".local_MANIFEST_DATA AS md,
        "local".local_OBJECT_EVENT AS ov,
        "local".local_OBJECT_EVENT_EPCS AS ov_epc,
        "local".local_EPC AS epc,
        "local".local_BUSINESS_LOCATION AS bloc,
        "local".local_OBJECT_EVENT_MANIFEST_DATA AS om
        WHERE
        md.id=om.manifest_id
        AND ov.deleted=0
        AND md.deleted=0
        AND ov.id=ov_epc.object_event_id
        AND ov.id=om.object_event_id
        AND bloc.id=ov.business_location_id
        AND ov_epc.epc_id=epc.id
        GROUP BY om.manifest_id

        UNION
        SELECT 
        trm.manifest_id AS manifest_id,
        trv.id AS eventId,
        'TRANSACTION_EVENT' AS eventType,
        trv.event_time AS eventDate,
        md.manifest_id AS manifestID,
        trv.business_step_code AS businessStepStr,
        md.manifest_version AS manifestVersion,
        md.external_location AS externalLocation,
        md.remark AS remark,
        epc.code as epcCode,
        bloc.location_code as locationCode
        FROM 
        "local".local_MANIFEST_DATA AS md,
        "local".local_TRANSACTION_EVENT AS trv,
        "local".local_TRANSACTION_EVENT_EPCS AS trv_epc,
        "local".local_EPC AS epc,
        "local".local_BUSINESS_LOCATION AS bloc,
        "local".local_TRANSACTION_EVENT_MANIFEST_DATA AS trm
        WHERE
        md.id=trm.manifest_id
        AND trv.deleted=0
        AND md.deleted=0
        AND trv.id=trv_epc.transaction_event_id
        AND trv.id=trm.transaction_event_id
        AND bloc.id=trv.business_location_id
        AND trv_epc.epc_id=epc.id
        GROUP BY trm.manifest_id

下面是使用GROUP BY＆amp; amp;的mysql中查询结果的快照。没有GROUP BY：

query result with GROUP BY

query result without GROUP BY

Ť

... @fredt 感谢您的详细解释..参考您的建议，我已经尝试过了..但不知怎的，我得到了这个错误：

错误：找不到表：语句中的TABL_B [SELECT TABL_B。* FROM（SELECT DISTINCT manifest_id FROM“local”.local_AGGREGATION_EVENT_MANIFEST_DATA）TABL_A]错误代码：-22

以下是我的询问：

SELECT TABL_B.* FROM (SELECT DISTINCT manifest_id FROM "local".local_AGGREGATION_EVENT_MANIFEST_DATA) TABL_A
LATERAL JOIN 
( SELECT 
    agm.manifest_id AS manifest_id,
    agv.id AS eventId,
    'AGGREGATION_EVENT' AS eventType,
    agv.event_time AS eventDate,
    md.manifest_id AS manifestID,
    agv.business_step_code AS businessStepStr,
    md.manifest_version AS manifestVersion,
    md.external_location AS externalLocation,
    md.remark AS remark,
    epc.code as epcCode,
    bloc.location_code as locationCode
    FROM 
    "local".local_MANIFEST_DATA AS md,
    "local".local_AGGREGATION_EVENT AS agv,
    "local".local_AGGREGATION_EVENT_EPCS AS agv_epc,
    "local".local_EPC AS epc,
    "local".local_BUSINESS_LOCATION AS bloc,
    "local".local_AGGREGATION_EVENT_MANIFEST_DATA AS agm
    WHERE
    md.id=agm.manifest_id
    AND agv.deleted=0
    AND md.deleted=0
    AND agv.id=agm.aggregation_event_id
    AND agv.id=agv_epc.aggregation_event_id
    AND agv.business_location_id=bloc.id
    AND bloc.id=agv.business_location_id
    AND agv_epc.epc_id=epc.id AND manifest_id = TABL_A.manifest_id  LIMIT 1 ) TABL_B

谢谢@fredt ..我注意到逗号上的内容已经添加到我的查询中了。我也尝试删除JOIN字。但仍然抛出相同的错误..

ERROR: Table not found in statement [SELECT TABL_B.* FROM (SELECT
DISTINCT MANIFEST_ID FROM "local".local_AGGREGATION_EVENT_MANIFEST_DATA)
AS TABL_A, LATERAL] Error Code: -22

Answer 1

使用HSQLDB 2.2.x或更高版本：

使用GROUP BY时，除了作为聚合的任何列之外，所有选定列都必须位于GROUP BY列表中。在您的示例中，GROUP BY列表应包含11列，而不是一列。

您可以使用DISTINCT，如SELECT DISTINCT COL1, COLB, COLC, ...中没有分组依据。 DISTINCT是用于对SELECT列表中的所有列进行分组的快捷方式。

通常，GROUP BY表示查询应仅为GROUP BY列表中的每个列值组合返回一行。允许聚合，因为它们将可能多行的值组合成一个值。

现在，如果您在GROUP BY列表中包含所有列，并且结果具有多个具有相同manifestID值的行，则意味着您无法单独对manifestID进行分组。

更新：您使用MySQL的查询结果表明它在这方面不是很严格。 manifestId = bhbhbhbh有超过20行，其他列中的值不相同。然而MySQL随机返回其中一行。这不是GROUP BY如何根据其他数据库（包括HSQLDB）支持的SQL标准工作。请参阅MySQL专家撰写的博客：

http://www.mysqlperformanceblog.com/2006/09/06/wrong-group-by-makes-your-queries-fragile/

如果您想要类似MySQL输出的内容，那么您需要这样的查询：

SELECT TABL_B.* FROM (SELECT DISTINCT manifestID FROM "local".local_AGGREGATION_EVENT_MANIFEST_DATA) TABL_A,
LATERAL 
( [YOUR SELECT STATEMENT WITHOUT GROUP BY] AND manifestID = TABL_A.manifestID  LIMIT 1 ) TABL_B

首先尝试使用VIEW中的一个选项，然后应用于其余部分。

您可以通过在LIMIT 1之前添加ORDER BY COL_NAME来选择返回哪一行。

HSQL视图错误：表达式不在聚合或GROUP BY列中

1 个答案: