alias parameter provides alternative names for a field that might appear in the URL for a query. It can be useful in cases when field names in a model change, but you have pre-existing URLs to queries that you want to keep functioning.
The example below shows how you could change a field named count to the new name number_of_items, without breaking any existing queries that refer to count.
You can also provide multiple alias’, in case you re-name a field multiple times. For example, if you renamed the above number_of_items field to number_of_order_items you could use:
Please note that
alias is used only to keep URLs functioning. It should not be used when referencing fields in LookML. For example: