子查询中的重复字段

Question

我正在尝试比较两个字符串列，其中一个在重复记录中并且位于子查询中：

#standardSQL
SELECT name AS produit
FROM   samples.overmind_reports 
WHERE  name IN (SELECT lines.article.sub_category.label FROM   samples.orders_lines)
ORDER BY produit 

错误：

无法访问具有类型值的字段文章 数组>，...>> [5:21]

表架构：

我试过FLATTEN，但它只是一个遗留功能？

#standardSQL
SELECT name AS produit
FROM   samples.overmind_reports 
WHERE  name IN (SELECT lines.article.sub_category.label FROM (FLATTEN(samples.orders_lines,lines)))
ORDER BY produit 

我明白了：

错误：语法错误：预期关键字 JOIN 但在 [6:50] 得到“)”

我没有使用UNNEST

Answer 1

试试这个：

#standardSQL
SELECT
  t1.name AS produit
FROM `samples.overmind_reports` t1
WHERE EXISTS(SELECT 1 FROM `samples.orders_lines` t2, UNNEST(t2.lines) lines WHERE lines.article.sub_category.label = t1.name)
ORDER BY 1

您可以使用模拟数据进行测试：

WITH `samples.overmind_reports` AS(
  SELECT 'name1' name UNION ALL
  SELECT 'name2' UNION ALL
  SELECT 'name3'
),
`samples.orders_lines` AS(
  SELECT ARRAY<STRUCT<article STRUCT<sub_category STRUCT<label STRING> > > > [STRUCT(STRUCT(STRUCT('label' AS label) AS sub_category) AS article), STRUCT(STRUCT(STRUCT('name1' AS label) AS sub_category) AS article)] lines UNION ALL
  SELECT ARRAY<STRUCT<article STRUCT<sub_category STRUCT<label STRING> > > > [STRUCT(STRUCT(STRUCT('label' AS label) AS sub_category) AS article), STRUCT(STRUCT(STRUCT('name1' AS label) AS sub_category) AS article)] lines UNION ALL
  SELECT ARRAY<STRUCT<article STRUCT<sub_category STRUCT<label STRING> > > > [STRUCT(STRUCT(STRUCT('label' AS label) AS sub_category) AS article), STRUCT(STRUCT(STRUCT('name3' AS label) AS sub_category) AS article)] lines
)

SELECT
  t1.name AS produit
FROM `samples.overmind_reports` t1
WHERE EXISTS(SELECT 1 FROM `samples.orders_lines` t2, UNNEST(t2.lines) lines WHERE lines.article.sub_category.label = t1.name)
ORDER BY 1