使用 php 在一列（SQL Server 2005 或更高版本）上选择 DISTINCT

Question

我已经尝试过 stackoverflow 中提供的代码，但仍然出现错误。有人可以告诉我我在哪里弄错了吗？谢谢你！这是我的代码：

$allOrdersFromToday = $Microinvest->MSelectList('SELECT * ROW_NUMBER() OVER (PARTITION BY Acct ORDER BY ID) AS RowNumber FROM Operations WHERE Date = "' . $todayDate . '" AND OperType = 2 ORDER BY Acct DESC) AS a', '*', 'a.RowNumber = 1');

应该输出为：

SELECT  *
FROM    (SELECT *,
                ROW_NUMBER() OVER (PARTITION BY Acct ORDER BY ID) AS RowNumber
         FROM   Operations
         WHERE  Date = "' . $todayDate . '" AND OperType = 2 ORDER BY Acct DESC) AS a
WHERE   a.RowNumber = 1

但我得到一个错误... :(

警告：mssql_query()：消息：关键字附近的语法不正确 '选择'。 （严重性 15）在 /var/www/functions/MssqlLibry.php 在线 29

Answer 1

在大多数情况下，SQL Server 不支持子查询中的order by。试试这个：

SELECT  a.*
FROM (SELECT o.*,
             ROW_NUMBER() OVER (PARTITION BY Acct ORDER BY ID) AS RowNumber
      FROM Operations o
      WHERE  Date = "' . $todayDate . '" AND
             OperType = 2
     ) a
WHERE a.RowNumber = 1
ORDER BY a.Acct DESC;

此外，由于日期的格式，您可能会遇到问题。您应该使用参数化查询而不是将值替换为字符串。