html/php sql query where clause - php

Question

This code works but the one belows shows an error
if(isset($_POST['month'])=='')
{
$sql = ('SELECT
substring(pin,5,2) as District,
count(arpn) as RPU,
sum(area) as AREA,
sum(marketvalue) as MV,
sum(assessedvalue) as AV
FROM 2017_oct_land
WHERE taxability= "T"
group by District ASC');
foreach ($pdo->query($sql) as $row) {
echo '<tr>';
echo '<td>'. $row['District'] . '</td>';
echo '<td class="RPU">'. $row['RPU'] . '</td>';
echo '<td class="AREA">'. $row['AREA'] . '</td>';
echo '<td class="MV">'. $row['MV'] . '</td>';
echo '<td class="AV">'. $row['AV'] . '</td>';
}
include 'total.php';
}
--with AND-- why do i get this "Warning: Invalid argument supplied for foreach() in C:\wamp64\www\reportview\pages\code2.php on line 20" with this code?
if(isset($_POST['month'])!=NULL)
{
$kind = $_POST['kind'];
echo "MONTH : ".$kind."<br/>";
$sql = ('SELECT
substring(pin,5,2) as District,
count(arpn) as RPU,
sum(area) as AREA,
sum(marketvalue) as MV,
sum(assessedvalue) as AV
FROM julcons
WHERE taxability="T" and actualuse like "' . $kind .'"');
foreach ($pdo->query($sql) as $row) {
echo '<tr>';
echo '<td>'. $row['District'] . '</td>';
echo '<td class="RPU">'. $row['RPU'] . '</td>';
echo '<td class="AREA">'. $row['AREA'] . '</td>';
echo '<td class="MV">'. $row['MV'] . '</td>';
echo '<td class="AV">'. $row['AV'] . '</td>';
}
include 'total.php';
}

Answer 1

Here you go ( untested ) but should be close
if(isset($_POST['kind'])) {
//why check month and then use kind? which is it..
//isset returns boolean, not null, null works because it's false but it's not correct IMO
$kind = $_POST['kind']; //what is this kind or month
echo "MONTH : ".$kind."<br/>";
$sql = 'SELECT
substring(pin,5,2) as District,
count(arpn) as RPU,
sum(area) as AREA,
sum(marketvalue) as MV,
sum(assessedvalue) as AV
FROM julcons
WHERE taxability="T" and actualuse like :kind';
$stmt = $pdo->prepare($sql);
$stmt->execute([':kind' => $kind]);
while( false !== ( $row = $stmt->fetch(PDO::FETCH_ASSOC))){
echo '<tr>';
echo '<td>'. $row['District'] . '</td>';
echo '<td class="RPU">'. $row['RPU'] . '</td>';
echo '<td class="AREA">'. $row['AREA'] . '</td>';
echo '<td class="MV">'. $row['MV'] . '</td>';
echo '<td class="AV">'. $row['AV'] . '</td>';
}
include 'total.php';
}
Sorry, but you had some really big mistakes in your code.