def validate_config(config):
    """Validate configuration dictionary"""
    errors = []
    required_config_keys = ['account', 'dbname', 'user', 'password',
        'warehouse', 'tables']
    for k in required_config_keys:
        if not config.get(k, None):
            errors.append(f'Required key is missing from config: [{k}]')
    return errors
