I'm ashamed to ask such a basic question but, here goes. I'm trying to change the datatype of a column in a saved table in Birquery. The SQL format I'm familiar with is "Alter Table TABLENAME Alter Column COLUMN NAME NEW COLUMN TYPE; (i.e., Alter Table Mytable Alter Column bike_id string"; Bigquery won't process this and tells me it's looking for either a "Drop", or "Set" keyword. What am I doing wrong. Thanks for the help.