Question

单行子查询返回多个行。

这是我在运行以下雪花代码时遇到的错误。我知道这是因为TO_VARCHAR函数不适用于整个表列。.关于如何解决并将其应用于整个列的任何想法吗？

SELECT sv.SKU
       , li.price
       , li.cost_price
       , pc.product_description
FROM raw.stitch_heroku.spree_line_items as li 
LEFT OUTER JOIN (SELECT * 
                 FROM raw.stitch_heroku.spree_variants 
                 WHERE LENGTH(raw.stitch_heroku.spree_variants.SKU) Between 4 and 5) as sv
ON li.variant_id = sv.id
LEFT JOIN (SELECT analytics.dbt_lcasucci.product_category.product_description
                  , TO_VARCHAR(analytics.dbt_lcasucci.product_category.product_ID) 
           FROM analytics.dbt_lcasucci.product_category) as pc
ON (SELECT TO_VARCHAR(analytics.dbt_lcasucci.product_category.product_ID) 
    FROM analytics.dbt_lcasucci.product_category) = sv.id
GROUP BY  sv.SKU,li.price,li.cost_price,pc.product_description

我必须将名为analytics.dbt_lcasucci.products的表的数据类型从int更改为varchar，因为如果不这样做，联接将无法识别这些字段，并且即使单元格的实际内容为匹配。

Answer 1

您在ON子句中有错误的子查询。

SELECT sv.SKU
    , li.price
    , li.cost_price
    , pc.product_description
FROM raw.stitch_heroku.spree_line_items as li 
LEFT OUTER JOIN ( 
    SELECT * 
    FROM raw.stitch_heroku.spree_variants 
    WHERE LENGTH(raw.stitch_heroku.spree_variants.SKU) Between 4 and 5
) as sv ON li.variant_id = sv.id
LEFT JOIN ( 
    SELECT analytics.dbt_lcasucci.product_category.product_description
    , TO_VARCHAR(analytics.dbt_lcasucci.product_category.product_ID) my_key
    FROM analytics.dbt_lcasucci.product_category 
    ) as pc  ON pc.my_key = sv.id

并且没有聚集功能..您不需要分组依据。如果不想重复行，最终请使用distinct

ON (SELECT TO_VARCHAR(analytics.dbt_lcasucci.product_category.product_ID) 
    FROM analytics.dbt_lcasucci.product_category) = sv.id

Answer 2

您需要将多个值表达式TO_VARCHAR(analytics.dbt_lcasucci.product_category.product_ID)转换为单个值表达式。

使用任何聚合功能，例如MIN()，MAX()，AVG()，SUM()等

例如，您可以按以下方式使用MAX(TO_VARCHAR(analytics.dbt_lcasucci.product_category.product_ID))：

SELECT
  sv.SKU,
  li.price, 
  li.cost_price,
  pc.product_description
FROM raw.stitch_heroku.spree_line_items as li 
LEFT OUTER JOIN (
  SELECT * 
  FROM raw.stitch_heroku.spree_variants 
  WHERE LENGTH(raw.stitch_heroku.spree_variants.SKU) Between 4 and 5
) as sv ON li.variant_id = sv.id
LEFT JOIN (
  SELECT analytics.dbt_lcasucci.product_category.product_description,
    TO_VARCHAR(analytics.dbt_lcasucci.product_category.product_ID) 
  FROM analytics.dbt_lcasucci.product_category
) as pc ON (
    SELECT MAX(TO_VARCHAR(analytics.dbt_lcasucci.product_category.product_ID))
    FROM analytics.dbt_lcasucci.product_category
  ) = sv.id
GROUP BY sv.SKU, li.price, li.cost_price, pc.product_description

单行子查询在雪花中返回多个行

2 个答案: