Question

我正在使用MSSQL，我有一个看起来像这样的表：

table1

id |  name  | description | apply start | apply end 
1  | 100-A  |    desc1    |    start1   |    end1     
2  | 100-B  |    desc1    |    start1   |    end1  
3  | 100-C  |    desc1    |    start1   |    end1
4  | 200-H  |    desc2    |    start2   |    end2
5  | 300-B  |    desc3    |    start3   |    end3
6  | 300-C  |    desc3    |    start3   |    end3

我正在尝试使用php将数据库中的这些值输出到表中，所以看起来像这样：

 Name  |   Description   |  Starting From  |  End
----------------------------------------------------
|100-A |                 |                 |       |
|100-B |      desc1      |     start1      |  end1 |
|100-C |                 |                 |       |
|--------------------------------------------------
|200-H |      desc2      |     start2      |  end2 |
|--------------------------------------------------
|300-B |                 |                 |       |
|300-C |      desc3      |     start3      |  end3 |
|--------------------------------------------------

如果所有值都相同，那么有没有办法对description，apply_start和apply_end列进行分组？

Answer 1

以下是我将如何在PHP中执行此操作的基本思路（假设您的描述中不会显示空字符，apply_start和apply_end列）。

// Assuming a result in this format
$result = array(
    array("id" => "1",
    "name" => "100-A",
    "description" => "desc1",
    "apply_start" => "start1",
    "apply_end" => "end1"),
. . .
);

foreach ($result as $row) {
    $groups[$row['description'] . "\0" 
          . $row['apply_start'] . "\0" 
          . $row['apply_end']][] = $row['name'];
}

foreach ($groups as $desc => $names) {
    echo implode(',', $names) . ' | ';
    echo implode(' | ', explode("\0", $desc)) . "\n";
}

输出：

100-A,100-B,100-C | desc1 | start1 | end1
200-H | desc2 | start2 | end2
300-B,300-C | desc3 | start3 | end3

Answer 2

在行格式化方面，并非如此，这是PHP的工作。但是，您可以通过向结果集添加内容来简化您的生活：

SELECT [name], [description], [apply start], [apply end]
    , COUNT([NAME])OVER(PARITION BY [description], [apply start], [apply end]) AS RowSpan
FROM table1
ORDER BY [description], [apply start], [apply end], [name]

现在，在使用PHP构建表时，请使用RowSpan作为分组列。您甚至可以在for循环中使用它，根据图表将Name输出到表格的单个单元格中。

Answer 3

正如Jaaz Cole所说，你应该用PHP做这件事，我不确定我是否通过提供这个帮助你，但如果你真的坚持的话，可以在SQL中完成。

SELECT DISTINCT STUFF((( SELECT ' ' + [Name] FROM table1 t WHERE t.[description] = table1.[description] AND t.[apply start] = table1.[apply start] AND t.[apply end] = table1.[apply end] FOR XML PATH (''), ROOT('x'), TYPE).value('/x[1]', 'VARCHAR(MAX)') ), 1, 1, '') AS [Name], [description] AS [Description], [apply start] AS [Starting From], [apply end] AS [End] FROM table1

php / sql：基于多列对行进行分组

3 个答案: