SQL - 如何从两个表中获取数据

Question

我有这些表格：

表-A

user_id
article_id
created_at

制品

user_id
created_at
...

我需要从相应用户的两个表中获取所有行（例如 user_id = 1 ）并按列created_at对其进行排序。怎么做？

我试过这样做：

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

但是这个查询不起作用。

Answer 1

试试这个

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

我会尝试以下查询： 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;