mysql WHERE和LAST

Question

我需要從基地獲得最後一條記錄，其中code = variable和complete = 0。

我用這個SQL：

SELECT email, date FROM users_recovery WHERE restore_key = '" . $code . "' AND complete = '0' 

例如DB：

email - code - complete - date 
test@email - code1 - 0 - 1111111 
test@email - code2 - 0 - 2222222 

如果變量$code將在DB值中的一個，那麼查詢將很好地工作，但我還需要檢查這是否是電子郵件地址的最後一個記錄，但我不明白。

Answer 1

嘗試......

SELECT b.email, b.date, b.complete, b.code 
FROM (SELECT email, 
       Max(date) AS date 
     FROM users_recovery 
     GROUP BY email 
     WHERE code = variable 
       AND complete = 0) a 
     JOIN users_recovery b 
     ON b.email = a.email 
      AND b.date = a.date 

Answer 2

使用ORDER BY與LIMIT限制結果到最後一條記錄（EE ORDER BY最近的日期）：

SELECT 
    email, 
    date 
FROM 
    users_recovery 
WHERE 
    restore_key = '" . $code . "' 
AND complete = '0' 
ORDER BY 
    date DESC 
LIMIT 1 

Answer 3

使用INNER JOIN與MAX（ ）

SELECT 
    email, 
    date 
FROM users_recovery AS ur 
    INNER JOIN (SELECT 
     MAX(DAte) AS date 
      FROM users_recovery) AS url 
    ON url.date = ur.date 
WHERE restore_key = '" . $code . "' 
    AND complete = '0'