使用 PHP 从同一个 SQL 表中选择两次

Question

我正在用 PHP 创建一个站点，其中列出了论坛的用户栏，并有一个名为“isOfficial”的列 - 我已经能够分别选择 NULL 和 IS NOT NULL 但我不确定如何同时选择两者.

尽我所能描述，我希望能够从同一个表中运行这两个：

第一个查询：

<?php include_once("assets/php/db.php");
      $sql = "SELECT ubFilename, ubGroupName, ubGroupOwner, ubOwnerLink, isOfficial, isActiveGroup FROM UBSUserbars WHERE NOT (isOfficial <=> NULL) ORDER BY ubGroupName";
      $resultset = mysqli_query($conn, $sql);      
      while( $record = mysqli_fetch_assoc($resultset) ) {
?>

第二次查询：

<?php include_once("assets/php/db.php");
      $sql = "SELECT ubFilename, ubGroupName, ubGroupOwner, ubOwnerLink, isOfficial, isActiveGroup FROM UBSUserbars WHERE (isOfficial <=> NULL) ORDER BY ubGroupName";
      $resultset = mysqli_query($conn, $sql);      
      while( $record = mysqli_fetch_assoc($resultset) ) {
?>

并让它们在同一页面上分别输出：

            <div class="cards">
                <?php
                    include_once("assets/php/db.php");
                    $sql = "SELECT ubFilename, ubGroupName, ubGroupOwner, ubOwnerLink, isOfficial, isActiveGroup FROM UBSUserbars WHERE NOT (isOfficial <=> NULL) ORDER BY ubGroupName";
                    $resultset = mysqli_query($conn, $sql);      
                    while( $record = mysqli_fetch_assoc($resultset) ) {
                    ?>
                <div class="col-sm-4 col-card <?php echo $record['isActiveGroup'] === 'active' ? 'active-group' : ''; ?>">
                <img src="i/OGUsers/<?php echo $record['ubFilename']; ?>">
                <hr>
                <h4 class="group"><?php echo $record['ubGroupName']; ?></h4>
                <span>Owner: <a class="owner" href="<?php echo $record['ubOwnerLink']; ?>"><?php echo $record['ubGroupOwner']; ?></a></span>
            </div>
        <?php } ?>

Answer 1

如何删除 SQL 查询中的 WHERE 子句：

$sql = "SELECT ubFilename, ubGroupName, ubGroupOwner, ubOwnerLink, isOfficial, isActiveGroup FROM UBSUserbars ORDER BY ubGroupName";

如果你想在一列中同时选择 A 和 B 值，你的 WHERE 子句应该是：

WHERE (table.column = A or table.column = B)

在您的情况下，您希望在 isOfficial 列中同时选择 NULL 和 NOT NULL 值，因此 WHERE 子句将是：

WHERE (isOfficial IS NULL or isOfficial IS NOT NULL)

这会变成

WHERE 1 

或者不需要WHERE子句

您的代码将变为：

<div class="cards">
<?php
    include_once("assets/php/db.php");
    $sql = "SELECT ubFilename, ubGroupName, ubGroupOwner, ubOwnerLink, isOfficial, isActiveGroup FROM UBSUserbars ORDER BY ubGroupName";
    $resultset = mysqli_query($conn, $sql);
    while( $record = mysqli_fetch_assoc($resultset) ) {
?>
    <div class="col-sm-4 col-card <?php echo $record['isActiveGroup'] === 'active' ? 'active-group' : ''; ?>">
        <img src="i/OGUsers/<?php echo $record['ubFilename']; ?>">
        <hr>
        <h4 class="group"><?php echo $record['ubGroupName']; ?></h4>
        <span>Owner: <a class="owner" href="<?php echo $record['ubOwnerLink']; ?>"><?php echo $record['ubGroupOwner']; ?></a></span>
    </div>
<?php } ?>