When searching for multiple criteria in different tables in PHP, what strategies can be employed to ensure only unique results are displayed?

When searching for multiple criteria in different tables in PHP, one strategy to ensure only unique results are displayed is to use the DISTINCT keyword in your SQL query. This will eliminate duplicate rows from the result set. Another approach is to use the GROUP BY clause along with aggregate functions like COUNT() to group the results by a unique identifier. Additionally, you can use PHP arrays to store and filter out duplicate values before displaying the final results. 

<?php
// Connect to your database
$pdo = new PDO("mysql:host=localhost;dbname=mydatabase", "username", "password");

// SQL query to select unique results from multiple tables
$sql = "SELECT DISTINCT column1, column2 FROM table1 JOIN table2 ON table1.id = table2.id WHERE condition";

// Execute the query
$stmt = $pdo->query($sql);

// Fetch and display the results
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
    echo $row['column1'] . ' - ' . $row['column2'] . '<br>';
}
?>

Keywords

SQL joins DISTINCT keyword array_unique function array_merge function array_intersect function

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