Types that can be converted into a complete, typed SQL query.
This is used internally to automatically add the right select clause when
none is specified, or to automatically add
RETURNING * in certain contexts.
A type which implements this trait is guaranteed to be valid for execution.
The SQL type of
What kind of query does this type represent?
Converts a type which semantically represents a SQL query into the actual query being executed. See the trait level docs for more.