SQL-如何從兩個表中獲取數據

Question

我有這些表：

table_a

user_id
article_id
created_at

文章

user_id
created_at
...

我需要從兩個表中為各自的用戶獲取所有行（讓我們說user_id = 1 ），並按created_at列對它們進行排序。 怎么做？

我試圖這樣做：

Model.find_by_sql('SELECT table_a.* FROM table_a JOIN articles ON articles.user_id = 1 WHERE table_a.user_id = 1')

但是此查詢將不起作用。

Answer 1

嘗試這個

SELECT table_a.* ,articles.*
FROM table_a 
LEFT JOIN articles ON articles.user_id = table_a.user_id 
WHERE table_a.user_id = 1
ORDER BY table_a. created_at

Answer 2

SELECT
  table_a.*
FROM 
 table_a
JOIN 
 articles 
ON 
 articles.user_id = table_a.user_id 
WHERE 
 table_a.user_id = 1
ORDER BY
 table_a.created_at ASC;

Answer 3

我將嘗試執行以下查詢： SELECT table_a.*, articles.* FROM table_a JOIN articles ON articles.user_id = table_a.user_id WHERE table_a.user_id = 1 ORDER BY table_a.created_at ASC;