MySQL (tablo):

+----+------+
| id | text |
+----+------+
| 1  |      |
+----+------+
| 2  | blah |
+----+------+
| 3  |      |
+----+------+
| 4  | blah |
+----+------+
| 5  | blah |
+----+------+

PHP:

$a = mysql_query("SELECT COUNT(*) AS count1 FROM `table`");
$b = mysql_fetch_assoc($a);

echo $b['count1'];

Çıktı:

5

Mümkünse, aynı sorgu içinde - Ancak, ben de text fields hangisinin filled saymak istiyorum.

Sonuç:

5 in total
3 with filled text fields