Zero Values

Dear List -

I have a payment/charges table -

mysql> describe Charges;
+----------+----------------------+------+-----+---------+-------+
| Field    | Type                 | Null | Key | Default | Extra |
+----------+----------------------+------+-----+---------+-------+
| Indx     | mediumint(9)         | NO   | PRI | 0       |       |
| Cust_Num | smallint(5) unsigned | NO   |     | NULL    |       |
| Balance  | decimal(10,2)        | YES  |     | NULL    |       |
| Payments | decimal(10,2)        | YES  |     | NULL    |       |
| Charges  | decimal(10,2)        | YES  |     | NULL    |       |
| Notes2   | text                 | YES  |     | NULL    |       |
| Date     | date                 | YES  |     | NULL    |       |
| PH1      | char(4)              | YES  |     | NULL    |       |
| PH2      | char(4)              | YES  |     | NULL    |       |
| PH3      | char(5)              | YES  |     | NULL    |       |
+----------+----------------------+------+-----+---------+-------+
10 rows in set (0.11 sec)

If Balance, Payments and Charges all equal 0, and then

select * from Charges,

the rows w/ all zero values will not be displayed.

Why?

TIA

Ethan