The From phrase from texp is required in all query templates.

The table expression texp is

Examples:

update c:b*2 from ([]a:1 2;b:3 4)   / call by value
select a,b from t                   / call by value
select a,b from `t                  / call by name
update c:b*2 from `:path/to/db      / call by name