Question

我希望缩小数据库范围，以仅保留最多记录。最新记录需要在特定字段中具有值。

ID  Account_nbr Date    Name
1   622     7/10/2018   Stu
2   622     7/24/2018   
3   151     7/18/2018   Taylor
4   151     7/24/2018   Taylor

这是数据库的示例。我希望代码执行此操作：

ID  Account_nbr Date    Name
1   622     7/10/2018   Stu
4   151     7/24/2018   Taylor

我尝试了以下代码：

Select m.*
FROM [table] m
 INNER JOIN 
(
SELECT last(Date) as LatestDate
,account_nbr
FROM [table]
WHERE Name IS NOT NULL
    GROUP BY account_nbr
) b 
ON m.Date = b.LatestDate
AND m.account_nbr = b.account_nbr

输出仅包含最近的日期，而未考虑名称字段中为空的记录。

Answer 1

我会做的：

// Set a simple Footer including the page number
$mpdf->setFooter('{PAGENO}');

$mpdf->WriteHTML('Section 1');$mpdf->WriteHTML('');

// You could also do this using
// $mpdf->AddPage('','','','','on');

$mpdf->WriteHTML('Section 2 - No Footer');
$mpdf->WriteHTML('<pagebreak resetpagenum="1" pagenumstyle="i" suppress="off" />');
$mpdf->WriteHTML('Section 3 - Starting with page a');

$mpdf->Output();

Answer 2

尝试一下：

Select 
    m.*
From 
    [table] As m
Where
    m.[Date] In
        (Select Max([Date])
        From [table] As T
        Where T.[Name] Is Not Null 
            And T.account_nbr = m.account_nbr)

获取一个字段不为空的最新记录

2 个答案: