What are the best practices for generating queries in PHP to check multiple database tables for specific true-false combinations?

When checking multiple database tables for specific true-false combinations in PHP, it is best to use SQL JOIN statements to efficiently retrieve the desired data. By joining the tables based on common keys and using conditional statements in the WHERE clause, you can filter the results to only include the desired combinations. 

<?php

// Establish a database connection
$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 check for specific true-false combinations in multiple tables
$sql = "SELECT *
        FROM table1
        INNER JOIN table2 ON table1.id = table2.id
        WHERE table1.column1 = true
        AND table2.column2 = false";

$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

SQL queries PHP database tables true-false combinations error handling

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