彙總來自Discourse的數據

Question

我目前有一個SQL查詢，它返回每週在某個類別中創建的主題數量。

SELECT 
    COUNT(*) AS topic_count, 
    DATE_TRUNC('week', created_at) AS week 
FROM topics 
WHERE 
    topics.deleted_at IS NULL AND 
    topics.category_id = (
     SELECT id 
     FROM categories 
     WHERE categories.name LIKE 'Category Name' 
    ) 
GROUP BY DATE_TRUNC('week', created_at) 
ORDER BY week DESC 

如何更改此查詢，以便我可以在類別表中看到每個類別的topic_count？所得的列，我想看到的是：

• 1類名稱的話題數
• 類別2名主題數
• ...
• 種類n名稱話題數
• 周

Answer 1

將分類名稱添加到查詢中，並按星期除外：

SELECT 
    categories.name, 
    DATE_TRUNC('week', created_at) AS week 
    COUNT(*) AS topic_count, 
FROM topics, 
    categories 
WHERE 
    topics.deleted_at IS NULL AND 
AND topics.category_id = categories.id 
AND categories.name LIKE 'Category Name' 
GROUP BY categories.name, DATE_TRUNC('week', created_at) 
ORDER BY categories.name, week DESC