What are the limitations of using the LIKE operator in SQL for similarity searches, and how can they be overcome in PHP?

The LIKE operator in SQL is limited in its ability to perform similarity searches due to its strict pattern matching capabilities. To overcome this limitation in PHP, we can use the Levenshtein distance algorithm to calculate the similarity between strings and retrieve results based on a certain threshold. 

function similaritySearch($searchTerm, $threshold = 3) {
    $results = [];
    
    // Query database to retrieve all possible matches
    $query = "SELECT column_name FROM table_name";
    $result = mysqli_query($connection, $query);
    
    while ($row = mysqli_fetch_assoc($result)) {
        $distance = levenshtein($searchTerm, $row['column_name']);
        
        if ($distance <= $threshold) {
            $results[] = $row['column_name'];
        }
    }
    
    return $results;
}

Keywords

LIKE operator SQL similarity searches limitations PHP

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