I have parent table let say `CAR`, and its multiple props/records in child table let say `CAR_PROPS`.

Now `CAR` has `modified_date` column like 

```
  `modified_date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,

```

Since `CAR` along with its all properties are treated as single object, we are expecting any change on its props (`CAR_PROPS`) alone should also update the parent table (`CAR's`) `modified_date`. 

However this is not real since `CAR` doest really updated hence `modified_date` is not changed when any of its child record got updated.

To simplify i want sql column modified\_date to be updated, though i dont have anything/anyother column to update in the row.

How to solve this problem?

NOTE: I dont want to pass the modified\_date from server, just want go with DB timestamp.