Question

我在Big Query的“香蕉”列中有这句话“我想买香蕉”。

我想获得“我想购买香蕉”。我怎么了看到LOWER和UPPER时我期望使用PROPER（Bananas）函数，但是好像不支持PROPER大小写吗？

DZ

Answer 1

下面的例子是fr BigQuery Standrad SQL

#standradSQL
CREATE TEMP FUNCTION PROPER(str STRING) AS (( 
  SELECT STRING_AGG(CONCAT(UPPER(SUBSTR(w,1,1)), LOWER(SUBSTR(w,2))), ' ' ORDER BY pos) 
  FROM UNNEST(SPLIT(str, ' ')) w WITH OFFSET pos
));
WITH `project.dataset.table` AS (
  SELECT 'i Want to buy bananas' str
)
SELECT str, PROPER(str) proper_str
FROM `project.dataset.table`

结果是

Row str                     proper_str   
1   i Want to buy bananas   I Want To Buy Bananas

Answer 2

我扩展了米哈伊尔·伯利安（Mikhail Berlyant）的答案，在大写连字符（-）之后也要大写，因为我需要对地名使用适当的大小写。必须从SPLIT功能切换为使用正则表达式来做到这一点。

我从头开始测试一个空字符串，然后返回一个空字符串（与null相对）以匹配本机UPPER和LOWER函数的行为。

CREATE TEMP FUNCTION PROPER(str STRING) AS (( 
  SELECT 
    IF(str = '', '',
      STRING_AGG(
        CONCAT(
          UPPER(SUBSTR(single_words,1,1)), 
          LOWER(SUBSTR(single_words,2))
        ), 
        '' ORDER BY position
      )
    )
  FROM UNNEST(REGEXP_EXTRACT_ALL(str, r' +|-+|.[^ -]*')) AS single_words
  WITH OFFSET AS position
));

WITH test_table AS (
  SELECT 'i Want to buy bananas' AS str
  UNION ALL
  SELECT 'neWCASTle upon-tyne' AS str
)

SELECT str, PROPER(str) AS proper_str
FROM test_table

输出

Row str                     proper_str   
1   i Want to buy bananas   I Want To Buy Bananas  
2   neWCASTle upon-tyne     Newcastle Upon-Tyne

大查询中的正确案例

2 个答案: