DataBase Query in WordPress

1. select query 

<?php

global $wpdb ;

$myrow $wpdb -> get_result'SELECT * FROM TableName' );
foreach(
$myrow as $row){

echo $value $row -> Columan_Name

}
?>

2. update query in wordpress 

<?php 

$wpdb -> query"UPDATE TableName SET col1 = 'val1' , col2 = 'val2' WHERE id=1 " ) ;

?>

3. delete query in wordpress 

<?php 

$wpdb -> query"DELETE FROM TableName WHERE id = 2" ) ;

?>

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