[英]Most efficient way to run multi-level mysqli query with php
I have a table: 我有一张桌子:
I have a list of id's that I have selected (highlighted) 我有一个已选择的ID列表(突出显示)
Using php and mysqli, how can I output data to the page (sorted by decending 'value', followed by the respective 'value's ascending 'name') in the most query-efficient way. 使用php和mysqli,我如何以查询效率最高的方式将数据输出到页面(按降序排列的“值”,然后是各个“值的升序”名称)。
Example: 例:
Try this ($myIDArray is from a previous query): 试试这个($ myIDArray来自上一个查询):
$myIDArray = [2,5,6,7,9,11]; //From previous query
$sql = "SELECT value, GROUP_CONCAT(name ORDER BY name DESC SEPARATOR ',')
FROM your_table
WHERE value IN (".implode(',', $myIDArray)."
GROUP BY value
ORDER BY value DESC";
After you get the result set, go through each row of the result and do something like this: 获得结果集后,遍历结果的每一行并执行以下操作:
echo "<ul>";
foreach($rows as $row)
{
echo "<li>$row->value <ul><li>";
echo implode('</li><li>', explode(",", $row->name));
echo "</li></ul></li>";
}
echo "</ul>";
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