What are the best practices for structuring SQL queries in PHP to avoid errors like "Unknown column 'entry.month' in 'field list'"?

When structuring SQL queries in PHP, it is important to ensure that all column names are correctly referenced in the query. To avoid errors like "Unknown column 'entry.month' in 'field list'", make sure to double-check the column names and table aliases used in the query. 

// Example of a correct SQL query in PHP to avoid "Unknown column 'entry.month' in 'field list'" error
$sql = "SELECT entry.month, entry.year, author.name 
        FROM entries AS entry
        JOIN authors AS author ON entry.author_id = author.id";
$result = mysqli_query($connection, $sql);

// Check if the query was successful
if ($result) {
    // Process the query result
    while ($row = mysqli_fetch_assoc($result)) {
        // Access the retrieved data
        echo $row['month'] . " " . $row['year'] . " - " . $row['name'] . "<br>";
    }
} else {
    // Handle query error
    echo "Error: " . mysqli_error($connection);
}

Keywords

SQL queries PHP error handling column names syntax errors

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