如何在 Big Query 中对数组施加 LIKE 运算符？答案

【问题标题】：How do I impose LIKE operator on an array in Big Query?如何在 Big Query 中对数组施加 LIKE 运算符？
【发布时间】：2022-11-24 03:34:24
【问题描述】：

我有一个包含一组字符串的数组，我试图在另一列字符串类型中搜索这些字符串。基本上是一种 LIKE 运算符，但带有数组。

我有的：

I have two tables keyword_table and config_table.

表 1：“关键字表”

category(STRING)  keywords(ARRAY)
fruits            ["orange", "berry", "apple"]
vegetables        ["bean", "carrot", "onion"]

表 2：“配置表”

code(STRING)     item(STRING)
001              blueberry
002              raspberry
003              white onions
004              red onions
005              onion
006              small beans
007              big beans

预期输出：

code(STRING)     category(STRING)
001              fruits
002              fruits
003              vegetables
004              vegetables
005              vegetables
006              vegetables
007              vegetables

有人可以帮我解决这个问题吗？

【问题讨论】：

标签： sql arrays google-bigquery

【解决方案1】：

您可以应用以下 sql 查询：

with keyword_table AS (
  select 
    "fruits" AS category,
     ["orange", "berry", "apple"] AS keywords
  UNION ALL
  select 
    "vegetables" AS category,
     ["bean", "carrot", "onion"] AS keywords
),

config_table AS (
  select "001" AS code, "orange" AS item
  UNION ALL
  select "002" AS code, "raspberry" AS item
  UNION ALL
  select "003" AS code, "carrot" AS item
  UNION ALL
  select "004" AS code, "red onions" AS item
  UNION ALL
  select "005" AS code, "onion" AS item
  UNION ALL
  select "006" AS code, "small beans" AS item
  UNION ALL
  select "007" AS code, "big beans" AS item
)

select
  code,
  calculatedCategory as category
from
(
  select 
    code,
    item,
    category,
    keywords,
    CASE WHEN item = keyword then category 
          ELSE ''
          END AS calculatedCategory,
  from config_table 
  cross join keyword_table,
  UNNEST(keywords) AS keyword
)
where calculatedCategory <> '';

结果是：

【讨论】：