MySQL查询不返回任何东西或返回错误的数据

Question

我有两张桌子。 表_1具有此字段。

table_1_id
name
image
adres

TABLE_2

table_2_id
name
email
phone
comment
datetime
need_id

我想在单击ID_1表格table_1从table_2加载所有具有table_1_id = 1行，我已经尝试过使用此查询

SELECT t1*, t2.* FROM table_1 t1, table_2 t2
                 WHERE t1.table_1_id = t2.need_id ORDER BY `DateTime` DESC

并显示空白页。 然后我尝试这样

SELECT t1.*, t2.* FROM table_1 t1
 JOIN table_2 t2 ON t1.table_1_id = t2.need_id ORDER BY ` DateTime` DESC 

无论单击什么，这都是从数据库返回的前5个结果。

Answer 1

假设您具有ID_1 ，则无需在查询中包含table_1 ：

SELECT * FROM table_2
WHERE need_id = ID_1 
ORDER BY `DateTime` DESC