Question

我一起用php，mysql和html来显示表格。但是我希望按时间戳对项目进行排序，并将具有相同ID的项目组合在一起。例如：

未排序的表格：

timestamp       id      name        description

14:02           2       Hans        Is very nice!
12:01           3       Jürgen      Is very bad!
10:03           2       Hans        Again good.
11:08           6       Anna        BAD!
06:09           11      Peter       Good.

右排序表：

timestamp       id      name        description

06:09           11      Peter       Good.
10:03           2       Hans        Again good.
14:02           2       Hans        Is very nice!
11:08           6       Anna        BAD!
12:01           3       Jürgen      Is very bad!

错误的排序表：

timestamp       id      name        description

06:09           11      Peter       Good.
10:03           2       Hans        Again good.
11:08           6       Anna        BAD!
12:01           3       Jürgen      Is very bad!
14:02           2       Hans        Is very nice!

我认为必须有一个内部联接：首先找到具有最早时间戳的项目。然后查看是否有另一个具有相同ID的项目：如果是，则必须将其放在具有最旧时间戳的项目旁边。

Answer 1

如果您对使用两者 MySQL 和 PHP的答案感兴趣，那么这将达到您想要的效果。

<强>的MySQL

SELECT `timestamp`, `id`, `name`, `description` FROM TableName ORDER BY `timestamp` DESC;

<强> PHP

// execute your query and put the results into $dateSortedArray
// I am assuming you know how to do this

$outterArray = array();

// iterate through each row of the $dateSortedArray
foreach($dateSortedArray as $row)
{
    // this is where we're doing the 'sub ordering' part
    // I'm pre-pending 'id_' in the index so that it is string-based
    if(!isset($outterArray["id_".$row["id"]]))
    {
        // if we do not see this id in our result array yet,
        // add a new array with this row in it
        $outterArray["id_".$row["id"]] = array($row);

    }
    else
    {
        // if we have already see this id before,
        // add the current row to the array with this id-based index
        $outterArray["id_".$row["id"]][] = $row;
    }

}


// iterate through our result array
foreach($outterArray as $innerArray)
{
    foreach($innerArray as $innerRow)
    {
        // simply dump out each line, comma-seperated
        echo implode(",", $innerRow) . "\r\n";
    }
}

Working Example

Answer 2

试试这个：

子查询将返回具有NewTimeStamp的临时列，该列对于相同的id列值将相同。

SELECT
    X.timestamp,
    X.Id,
    X.name,
    X.description
FROM
(
    SELECT TMain.timestamp,TMain.id,TMain.name,TMain.description
    (
       CASE WHEN ((SELECT COUNT(1) FROM @tblTest T WHERE T.Id=TMain.Id))>0 
       THEN (SELECT TOP(1) timestamp  FROM @tblTest T WHERE T.Id=TMain.Id ORDER BY timestamp) 
       ELSE timestamp END 
    ) AS NewTimeStamp FROM @tblTest TMain
)X
ORDER BY X.NewTimeStamp,X.timestamp

SQL按时间戳排序，按ID

2 个答案: