Drupal 7 Views 3 column names must be lower case

I'm just getting my feet wet with the Drupal 7, Views 3 hook_views_data API which describes a table to Views.

I had a table like this :

create table tbl(
  myid    varchar(30) COMMENT 'Primary key',
  myPrice float

I was getting an error of this form when I was trying to display the view :

Undefined property: stdClass::$tbl_myPrice in
 views_handler_field_numeric->render() (line 75 of 

Renaming the table to my_price solved the problem.