How can one troubleshoot and resolve errors when a JOIN statement returns an empty result in PHP?

When a JOIN statement returns an empty result in PHP, it could be due to incorrect table relationships or conditions in the JOIN clause. To troubleshoot and resolve this issue, check the JOIN conditions to ensure they are correctly matching records in both tables. Additionally, verify that the data in the tables being joined actually have matching values for the JOIN condition. 

<?php

// Example query with JOIN statement
$query = "SELECT * FROM table1 JOIN table2 ON table1.id = table2.table1_id";

// Execute the query
$result = mysqli_query($conn, $query);

// Check if the result set is empty
if(mysqli_num_rows($result) == 0) {
    echo "No results found.";
} else {
    // Process the results
    while($row = mysqli_fetch_assoc($result)) {
        // Do something with the data
    }
}

?>

Keywords

JOIN statement empty result troubleshooting PHP errors

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