[英]PHP MySQL query select DISTINCT but display Limited Rows order by date
我需要DISTINCT的帮助。 我想显示不同的行,但仅按日期显示最新的拖车行顺序(col3)
此表来自数据库的示例:
+----+-----+------------+
|col1|col2 |col3 |
+----+-----+------------+
|A |one |1-jul-2013 |
|A |two |2-jul-2013 |
|A |three|3-jul-2013 |
|A |four |4-jul-2013 |
|A |five |5-jul-2013 |
|B |one |1-jul-2013 |
|B |two |2-jul-2013 |
|B |three|3-jul-2013 |
|B |four |4-jul-2013 |
|B |five |5-jul-2013 |
|B |six |6-jul-2013 |
|B |seven|7-jul-2013 |
|B |eight|8-jul-2013 |
+----+-----+-----+
$query = mysql_query('select * from table1 ORDER BY col3 DESC');
$results = array();
while($row = mysql_fetch_assoc($query)) {
$col1= $row['col1'];
// This is basically grouping your rows by col1
if(!isset($results[$col1]))
$results[$col1] = array();
$results[$col1][] = $row;
}
echo "<tr>";
foreach($results as $col1=> $rows) {
echo "<td>".$col1."</td>";
foreach($rows as $row) {
echo "<td>".$row['col2']."</td>";
}
echo"</tr>";
}
我需要对其进行一些修改。.我想要与众不同,仅显示最新的2行
我希望显示器看起来像这样:
A |one |two
B |one |two
以下是查询,
$query = mysql_query('select DISTINCT `column name` from table1 ORDER BY col3 DESC LIMIT 2');
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