select query in wordpress

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I am trying to do this by 2 hours.
I have custom fields in database and I want to get post_id by the meta keys or meta values.
I am doing like this 

$post_id = $wpdb->get_var("SELECT post_id FROM $wpdb->postmeta WHERE (meta_key = 'mfn-post-link1' AND meta_value = '". $from ."')");
print_r($post_id); // giving only 140

this is working fine, but this is giving only one post_id and I want all possible post_id matched by meta_value.
for example :
I have three post 140,141,142, in database. But by this query I am only getting 140.
Any Idea how to get all possible post_id by this query or any other way by comparing meta_fields…

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Thanks

Post Views: 1

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3 comments 

  1. $post_id = $wpdb->get_results("SELECT post_id FROM $wpdb->postmeta WHERE (meta_key = 'mfn-post-link1' AND meta_value = '". $from ."')");
print_r($post_id); /

  3. <?php
$user_id = 1;
global $wpdb;
$wpdb_prefix = $wpdb->prefix;
$wpdb_tablename = $wpdb_prefix.'Table_Name';
$result = $wpdb->get_results(sprintf('SELECT `colum1`, `colum2` FROM `%2$s` WHERE `user_id` = %d LIMIT 1', $user_id, $wpdb_tablename));

print_r($result); exit;
?>