I am trying to SUM a column only IF the cell is a round number. Doesn't matter what the number is. 

I am unsure of what wildcard to put and if I need to put it into parenthesis or not. 

```
SELECT 
SUM(CASE WHEN(TXN_AMOUNT_BASE = '%0.00' 
        THEN TXN_AMOUNT_BASE ELSE 0 END))AS 
       Round_Dollar_Wires
  FROM IDP_PRD_INTERFACE.AML_L3_HPT_GRP.V_TRANSACTIONS
  GROUP BY ACCOUNT_SOURCE_REF_ID
 LIMIT 100;

```

I am looking to get the sum of every transaction that is a round dollar amount. (So sum every transaction that looks like $1000.00, $100.00, $50.00, $ $1500.00. But not $1555.00, $50.45, or $125.)