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User warning: The following theme is missing from the file system: responsive_green. For information about how to fix this, see the documentation page. in _drupal_trigger_error_with_delayed_logging() (line 1143 of /var/www/moscovie.com/includes/bootstrap.inc).

The best way to add a column to an existing table in drupal

/*
* Implements hook_schema_alter().
*/
function mymodule_schema_alter(&$schema) {
$schema['tablename']['fields']['fieldname'] = array(
'type' => 'varchar',
'default' => null
);
}

/*
* Implements hook_install().
*/
function mymodule_install() {
if (!db_field_exists('tablename', 'fieldname')) {
$schema = drupal_get_schema('tablename');
db_add_field('tablename', 'fieldname', $schema['fields']['fieldname']);
}
}

/*
* Implements hook_uninstall().
*/
function mymodule_uninstall() {
if (db_field_exists('tablename', 'fieldname')) {
db_drop_field('tablename', 'fieldname');
}
}

The code has been tested and works
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