SQL 服务器：来自多个表的 select

Question

表帐户：

+----+------+----------+
| ID | Nick | Dono_CID |
+----+------+----------+
|  2 | Bart |        3 |
+----+------+----------+

表登录：

+------------+------------+
| Jogador_ID | TS_Logou   |
+------------+------------+
|          2 | 1590116475 |
|          2 | 1590118258 |
+------------+------------+

简而言之，我打算确定是否有一行 TS_Logou 小于 1 个月前的 Timestamp，如果 Dono_CID != -1

OBS： Accounts.ID = Logins.Jogador_ID

OBS²：登录表中有多条记录。 我要 select 最后一个，按 DESC 顺序

我的尝试：

SELECT 
    ct.Nick, 
    ct.Dono_CID 
FROM 
    Contas AS ct 
INNER JOIN 
    Logins AS lg ON lg.Jogador_ID = ct.ID 
WHERE 
    ct.Dono_CID != -1 
    AND lg.TS_Logou < 1587524400 
GROUP BY 
    lg.Jogador_ID 
ORDER BY 
    lg.TS_Logou DESC 
LIMIT 1

Answer 1

根据您的尝试，我了解到 TS_Logou < 1587524400 表示超过一个月。 我正在尝试 select 满足过滤条件的最大 TS_Logou 登录。

SELECT TOP 1 a.Id, a.Nick, a.Dono_CID
FROM Logins as l
Inner Join Account as a
a.Id = l.Jogador_Id 
WHERE a.Dono_CID <> -1 
AND a.TS_Logou < 1587524400
ORDER BY l.TS_Logou DESC

Answer 2

在听到，我尝试 select max TS_Logou form Logins 为用户和该表加入帐户表。 这对我有用

SELECT 
 ac.Nick, 
 ac.Dono_CID 
FROM 
    Account AS ac 
INNER JOIN 
 (SELECT l.Jogador_ID,MAX(l.TS_Logou) FROM Logins AS l 
   WHERE DATE(l.TS_Logou) < DATEADD(month, -1, GETDATE()) 
   GROUP BY l.Jogador_ID) AS lg 
 ON lg.Jogador_ID = ac.ID 
WHERE 
 ac.Dono_CID <> -1