How to convert PostgreSQL 9.4's jsonb type to float

Question

I\'m trying the following query:

SELECT (json_data->\'position\'->\'lat\') + 1.0 AS lat FROM updates LIMIT 5;

(The +1.0 is just there

Answer 1

When creating a view I used CAST:

create view mydb.myview as
            select id,
            config->>'version' as version,
            config->>'state' as state,
            config->>'name' as name,
            config->>'internal-name' as internal_name,
            config->>'namespace' as namespace,         
            create_date,
            update_date,
            CAST(config ->> 'version' as double precision) as version_number
            from mydb.mytbl;