统计一个词被说了多少次

数据与报告
1

我对查看论坛上特定词语使用趋势感到好奇，有什么查询可以让我看到每周某个子字符串被提及了多少次吗？

2

在 ChatGPT 的帮助下找到了一个可行的方案

WITH date_series AS (
  SELECT generate_series(
           DATE_TRUNC('week', MIN(created_at)),  -- 第一周的开始
           DATE_TRUNC('week', MAX(created_at)),  -- 最后一周的开始
           '1 week'::interval                    -- 每周间隔
         ) AS week_start
  FROM posts
),
posts_with_substring AS (
  SELECT
    DATE_TRUNC('week', created_at) AS week_start,
    COUNT(*) AS total_posts,
    SUM((LENGTH(raw) - LENGTH(REPLACE(lower(raw), lower('your_substring'), ''))) / LENGTH('your_substring')) AS substring_count
  FROM
    posts
  WHERE
    raw ILIKE '%test%'
  GROUP BY
    DATE_TRUNC('week', created_at)
)
SELECT
  ds.week_start,
  COALESCE(pws.total_posts, 0) AS total_posts
FROM
  date_series ds
LEFT JOIN
  posts_with_substring pws ON ds.week_start = pws.week_start
ORDER BY
  ds.week_start
3

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.