How Can I Retrieve Data from Tables with Ambiguous Column Names in SQL and PHP?

Handling tables with ambiguous column names in SQL and PHP

In a relational database, multiple tables may have columns with the same name, which may cause ambiguity when retrieving data. To resolve this issue, consider the following:

Use column aliases

An effective method is to assign an alias to the target column. This allows you to give each column a unique name, ensuring clarity and easy access.

As an example, both the NEWS and USERS tables contain a column named id. In order to retrieve the news ID and user ID and use different column names, use the following SQL statement:

<code class="language-sql">SELECT news.id AS newsId, users.id AS userId FROM news JOIN users ON news.user_id = users.id</code>

In PHP you can access column data using assigned aliases:

<code class="language-php">$query = 'SELECT news.id AS newsId, users.id AS userId, [此处添加其他字段] FROM news JOIN users ON news.user_id = users.id';
$result = $db->query($query);
$row = $result->fetch_assoc();
echo $row['newsId']; // 新闻ID
echo $row['userId']; // 用户ID</code>

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