Dimension columns

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Dimension columns identify a given dimension.

Dimension column	Type	Description	Applicable dimensions
`date`	`Date`	A date-time, indicating the start of the reporting period for a given row.	`by_hour` `by_smallest_time_bucket` `by_campaign_by_smallest_time_bucket` `by_site_by_smallest_time_bucket`
`campaign_id`	`Number`	The numeric campaign ID.	`by_campaign` `by_campaign_by_smallest_time_bucket`
`campaign_name`	`String`	The human-readable campaign name.	`by_campaign` `by_campaign_by_smallest_time_bucket`
`site_id`	`Number`	The numeric Site ID.	`by_site` `by_site_by_smallest_time_bucket`
`site_name`	String	The human-readable site name.	`by_site` `by_site_by_smallest_time_bucket`
`country`	`String`	The 2-letter ISO-3166 country code.	`by_country` `by_country_by_smallest_time_bucket`
`country_name`	`String`	The human-readable country name.	`by_country` `by_country_by_smallest_time_bucket`
`platform`	`String`	The platform enum. Possible values: `DESK`, `PHON`, `TBLT`.	`by_platform` `by_platform_by_smallest_time_bucket`
`platform_name`	`String`	The human-readable platform name.	`by_platform` `by_platform_by_smallest_time_bucket`

Dimension	Dimension column(s)
`by_hour`	`date`
`by_smallest_time_bucket`	`date`
`by_campaign`	`campaign_id` `campaign_name`
`by_campaign_by_smallest_time_bucket`	`date` `campaign_id` `campaign_name`
`by_site`	`site_id` `site_name`
`by_site_by_smallest_time_bucket`	`date` `site_id` `site_name`
`by_country`	`country` `country_name`
`by_country_by_smallest_time_bucket`	`date` `country` `country_name`
`by_platform`	`platform` `platform_name`
`by_platform_by_smallest_time_bucket`	`date` `platform` `platform_name`