php - mysql WHERE 和 LAST

Question

我需要从 base 获取最后一条记录 wherecode = variable和complete = 0.

我使用这个 SQL：

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

例如数据库：

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

如果变量$code将是 DB 中的值之一，那么查询将完美地工作，但我还需要检查它是否是这封电子邮件的最后一条记录，但我不明白如何。

Answer 1

使用ORDER BYwithLIMIT将结果限制为最后一条记录（ee ORDER BY 最近日期）：

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

Answer 2

试试这个...

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 3

将 INNER JOIN 与 MAX() 一起使用

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'