/media/sda-magnetic/david/Dok-15-2023-11-27/informatik/www-intel-compute-stick-2022-06-13/047/quantity.php

<?php 
include ('/home/david/mysqldata.php');

$handle = mysql_connect ("localhost", $MYSQL_NAME, $MYSQL_PASSWORD);

mysql_query ("CREATE DATABASE quantity047", $handle);

mysql_select_db ("quantity047", $handle);

mysql_query ("CREATE TABLE a (x VARCHAR (4))", $handle);
mysql_query ("CREATE TABLE b (x VARCHAR (4))", $handle);
mysql_query ("CREATE TABLE c (x VARCHAR (4))", $handle);

for ($i = 0;  $i < 20;  $i++) {
    mysql_query ("INSERT INTO a VALUES (\"" . rand () % 64 . "\")", $handle);
    mysql_query ("INSERT INTO b VALUES (\"" . rand () % 64 . "\")", $handle);
    mysql_query ("INSERT INTO c VALUES (\"" . rand () % 64 . "\")", $handle);
}

/*
a OR b
a OR c
b OR c

a AND b
a AND c
b AND c

(a OR b) AND c = a AND c OR b AND c
(a OR c) AND b = a AND b OR c AND b
(b OR c) AND a = b AND a OR c AND a
*/

/*
a OR b
a OR c
b OR c

SELECT x FROM (SELECT x FROM a UNION SELECT x FROM b) x
SELECT x FROM (SELECT x FROM a UNION SELECT x FROM c) x
SELECT x FROM (SELECT x FROM b UNION SELECT x FROM c) x
*/

/*
a AND b
a AND c
b AND c

SELECT x FROM (SELECT x FROM a INTERSECT SELECT x FROM b) x
SELECT x FROM (SELECT x FROM a INTERSECT SELECT x FROM c) x
SELECT x FROM (SELECT x FROM b INTERSECT SELECT x FROM c) x
*/

/*
(a OR b) AND c = a AND c OR b AND c

SELECT x FROM (
    SELECT x FROM (SELECT x FROM a UNION SELECT x FROM b) x
    INTERSECT
    SELECT x FROM c
) x ORDER BY x

SELECT x FROM (
    SELECT x FROM (SELECT x FROM a INTERSECT SELECT x FROM c ) x 
    UNION 
    SELECT x FROM (SELECT x FROM b INTERSECT SELECT x FROM c) x
) x ORDER BY x
*/

/*
(a OR c) AND b = a AND b OR c AND b

SELECT x FROM (
    SELECT x FROM (SELECT x FROM a UNION SELECT x FROM c) x
    INTERSECT
    SELECT x FROM b
) x ORDER BY x

SELECT x FROM (
    SELECT x FROM (SELECT x FROM a  INTERSECT SELECT x FROM b) x
    UNION 
    SELECT x FROM (SELECT x FROM c INTERSECT SELECT x FROM b) x
) x ORDER BY x
*/

/*
(b OR c) AND a = b AND a OR c AND a

SELECT x FROM (
    SELECT x FROM (SELECT x FROM b UNION SELECT x FROM c) x
    INTERSECT
    SELECT x FROM a
) x ORDER BY x

SELECT x FROM (
    SELECT x FROM (SELECT x FROM b INTERSECT SELECT x FROM a) x
    UNION 
    SELECT x FROM (SELECT x FROM c INTERSECT SELECT x FROM a) x
) x ORDER BY x
*/


$result = mysql_query ("SELECT x FROM (SELECT x FROM a UNION SELECT x FROM b) x", $handle);
while ($row = mysql_fetch_assoc ($result))
    echo $row ["x"] . "<br>\n";
echo "<br><br>\n\n";
$result = mysql_query ("SELECT x FROM (SELECT x FROM a UNION SELECT x FROM c) x", $handle);
while ($row = mysql_fetch_assoc ($result))
    echo $row ["x"] . "<br>\n";
echo "<br><br>\n\n";
$result = mysql_query ("SELECT x FROM (SELECT x FROM b UNION SELECT x FROM c) x", $handle);
while ($row = mysql_fetch_assoc ($result))
    echo $row ["x"] . "<br>\n";
echo "<br><br>\n\n";
$result = mysql_query ("SELECT x FROM (SELECT x FROM a INTERSECT SELECT x FROM b) x", $handle);
while ($row = mysql_fetch_assoc ($result))
    echo $row ["x"] . "<br>\n";
echo "<br><br>\n\n";
$result = mysql_query ("SELECT x FROM (SELECT x FROM a INTERSECT SELECT x FROM c) x", $handle);
while ($row = mysql_fetch_assoc ($result))
    echo $row ["x"] . "<br>\n";
echo "<br><br>\n\n";
$result = mysql_query ("SELECT x FROM (SELECT x FROM b INTERSECT SELECT x FROM c) x", $handle);
while ($row = mysql_fetch_assoc ($result))
    echo $row ["x"] . "<br>\n";
echo "<br><br>\n\n";
$result = mysql_query ("SELECT x FROM ( 
    SELECT x FROM (SELECT x FROM a UNION SELECT x FROM b) x 
    INTERSECT 
    SELECT x FROM c 
) x ORDER BY x", $handle);
while ($row = mysql_fetch_assoc ($result))
    echo $row ["x"] . "<br>\n"; 
echo "<br><br>\n\n"; 
$result = mysql_query ("SELECT x FROM ( 
    SELECT x FROM (SELECT x FROM a INTERSECT SELECT x FROM c ) x 
    UNION 
    SELECT x FROM (SELECT x FROM b INTERSECT SELECT x FROM c) x 
) x ORDER BY x", $handle);
while ($row = mysql_fetch_assoc ($result))
    echo $row ["x"] . "<br>\n";
echo "<br><br>\n\n";
$result = mysql_query ("SELECT x FROM ( 
    SELECT x FROM (SELECT x FROM a UNION SELECT x FROM c) x 
    INTERSECT 
    SELECT x FROM b 
) x ORDER BY x", $handle);
while ($row = mysql_fetch_assoc ($result))
    echo $row ["x"] . "<br>\n";
echo "<br><br>\n\n";
$result = mysql_query ("SELECT x FROM (
    SELECT x FROM (SELECT x FROM a  INTERSECT SELECT x FROM b) x 
    UNION 
    SELECT x FROM (SELECT x FROM c INTERSECT SELECT x FROM b) x 
) x ORDER BY x", $handle);
while ($row = mysql_fetch_assoc ($result))
    echo $row ["x"] . "<br>\n";
echo "<br><br>\n\n";
$result = mysql_query ("SELECT x FROM ( 
    SELECT x FROM (SELECT x FROM b UNION SELECT x FROM c) x 
    INTERSECT 
    SELECT x FROM a 
) x ORDER BY x", $handle);
while ($row = mysql_fetch_assoc ($result))
    echo $row ["x"] . "<br>\n";
echo "<br><br>\n\n";
$result = mysql_query ("SELECT x FROM ( 
    SELECT x FROM (SELECT x FROM b INTERSECT SELECT x FROM a) x 
    UNION 
    SELECT x FROM (SELECT x FROM c INTERSECT SELECT x FROM a) x 
) x ORDER BY x", $handle);
while ($row = mysql_fetch_assoc ($result))
    echo $row ["x"] . "<br>\n";
echo "<br><br>\n\n";


?>