SQL 动态数据透视组错误 1172

Question

我一直试图让 SQL 查询在我的数据库上运行，但没有太多的 SQL 知识和具有多层深度的数据库，这让我很头疼。我真的很接近我想要实现的目标，我认为这只是我误解的一个小细节。

我有一张orders 的表格，我想很好地导出它。我正在使用动态枢轴为每个purchasables.sku 生成一个新列，该列中的lineitems.qty 属于order。我只想显示属于users 的orders，其中usergroup.id 是4。然后我想显示content.field_customerReference 字段，其中content.elementId 等于orders.id。

我一直在使用this 解释并最终得到这个查询：

SET @@group_concat_max_len = 32000;
SET @sql = NULL;

SELECT
  GROUP_CONCAT(DISTINCT
    CONCAT(
      'MAX(IF(purchasables.sku = ''',
      purchasables.sku,
      ''', lineitems.qty, NULL)) AS ',
      CONCAT("'", purchasables.sku, "'")
    )
  ) INTO @sql
FROM craft_commerce_orders AS orders
JOIN craft_commerce_customers AS customers
  on customers.id = orders.customerId
JOIN craft_users AS users
  on users.id = customers.userId
JOIN craft_commerce_lineitems AS lineitems
    ON lineitems.orderId = orders.id
JOIN craft_commerce_purchasables AS purchasables
    ON purchasables.id = lineitems.purchasableId
JOIN craft_content AS content
    ON content.elementId = orders.id
JOIN craft_usergroups_users AS usergroup_users
    ON usergroup_users.userId = users.id
WHERE usergroup_users.groupId = 4
GROUP BY orders.id;

SET @sql = CONCAT(
    'SELECT 
        orders.dateCreated AS Datum,
        orders.id AS ID,
        users.firstName AS Gebruiker,
        content.field_customerReference AS Referentie,
        ', @sql, '
      FROM craft_commerce_orders AS orders
    JOIN craft_commerce_customers AS customers
        on customers.id = orders.customerId
    JOIN craft_users AS users
        on users.id = customers.userId
    JOIN craft_commerce_lineitems AS lineitems
        ON lineitems.orderId = orders.id
    JOIN craft_commerce_purchasables AS purchasables
        ON purchasables.id = lineitems.purchasableId
    JOIN craft_content AS content
        ON content.elementId = orders.id
    JOIN craft_usergroups_users AS usergroup_users
        ON usergroup_users.userId = users.id
    WHERE usergroup_users.groupId = 4
    GROUP BY orders.id');

PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

这给出了错误1172 'Result consisted of more than one row'。它可以在没有GROUP BY orders.id 的情况下工作，但随后它将所有结果合并到一行中。我希望每个订单都是单独的一行。如果我删除动态枢轴并手动填写sku，它可以工作：

SELECT orders.dateCreated,
       orders.id,
       users.firstName,
       MAX(IF(purchasables.sku = '999992', lineitems.qty, NULL)) as '999992',
       MAX(IF(purchasables.sku = '9999991', lineitems.qty, NULL)) as '9999991',
       content.field_customerReference
FROM craft_commerce_orders AS orders
JOIN craft_commerce_customers AS customers
  on customers.id = orders.customerId
JOIN craft_users AS users
  on users.id = customers.userId
JOIN craft_commerce_lineitems AS lineitems
    ON lineitems.orderId = orders.id
JOIN craft_commerce_purchasables AS purchasables
    ON purchasables.id = lineitems.purchasableId
JOIN craft_content AS content
    ON content.elementId = orders.id
JOIN craft_usergroups_users AS usergroup_users
    ON usergroup_users.userId = users.id
WHERE usergroup_users.groupId = 4
GROUP BY orders.id

感谢任何帮助。

编辑：这是我根据霍根的建议运行的查询：

SET @sql = NULL;

SELECT
  GROUP_CONCAT(DISTINCT X.X) INTO @sql
FROM 
(
  SELECT DISTINCT
      CONCAT(
        'MAX(IF(purchasables.sku = ''',
        purchasables.sku,
        ''', lineitems.qty, NULL)) AS ''',
        purchasables.sku, '''' ) as X
  FROM craft_commerce_orders AS orders
  JOIN craft_commerce_customers AS customers on customers.id = orders.customerId
  JOIN craft_users AS users on users.id = customers.userId
  JOIN craft_commerce_lineitems AS lineitems ON lineitems.orderId = orders.id
  JOIN craft_commerce_purchasables AS purchasables ON purchasables.id = lineitems.purchasableId
  JOIN craft_content AS content ON content.elementId = orders.id
  JOIN craft_usergroups_users AS usergroup_users ON usergroup_users.userId = users.id
  WHERE usergroup_users.groupId = 4
) AS X;

PREPARE stmt FROM @sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

这给出了错误

1064 you have an error in your sql syntax near 'MAX(IF(purchasables.sku = '999992', lineitems.qty, NULL)) AS '999992',MAX(IF(pur' at line 1

Answer 1

在这里我做了一个单独的子查询。如果仍然出现错误，您可以自行测试——我认为问题出在"s

SELECT
  GROUP_CONCAT(DISTINCT X.X) INTO @sql
FROM 
(
  SELECT DISTINCT
      CONCAT(
        'MAX(IF(purchasables.sku = ''',
        purchasables.sku,
        ''', lineitems.qty, NULL)) AS ''',
        purchasables.sku, '''' ) as X
  FROM craft_commerce_orders AS orders
  JOIN craft_commerce_customers AS customers on customers.id = orders.customerId
  JOIN craft_users AS users on users.id = customers.userId
  JOIN craft_commerce_lineitems AS lineitems ON lineitems.orderId = orders.id
  JOIN craft_commerce_purchasables AS purchasables ON purchasables.id = lineitems.purchasableId
  JOIN craft_content AS content ON content.elementId = orders.id
  JOIN craft_usergroups_users AS usergroup_users ON usergroup_users.userId = users.id
  WHERE usergroup_users.groupId = 4
) AS X