In what scenarios would using UNION ALL in PHP be a suitable solution for querying identical tables?

When querying identical tables in PHP, using UNION ALL can be a suitable solution when you want to combine the results from multiple identical tables into a single result set. This can be useful when you have multiple tables with the same structure and want to retrieve data from all of them in a single query. 

<?php

// Assuming we have two identical tables: table1 and table2
// Connect to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Query to select data from both tables using UNION ALL
$sql = "SELECT * FROM table1
        UNION ALL
        SELECT * FROM table2";

$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // Output data of each row
    while($row = $result->fetch_assoc()) {
        echo "Column1: " . $row["column1"]. " - Column2: " . $row["column2"]. "<br>";
    }
} else {
    echo "0 results";
}

$conn->close();

?>

Keywords

UNION ALL PHP querying identical tables scenarios

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