PostgreSQL: IN A SINGLE SQL SYNTAX order by numeric value computed from a text column

Question

A column has a string values like \"1/200\", \"3.5\" or \"6\". How can I convert this String to numeric value in single SQL query?

My actual SQL is more complicated, h

Answer 1

I managed to solve my problem. Thanks all. It goes something like this, in a single SQL. (I'm using POSTGRESQL)

It will sort a string coming in as either "#", "#.#" or "1/#"

SELECT id, number_value_in_string FROM table ORDER BY CASE WHEN position('1/' in number_value_in_string) = 1 
    THEN 1/substring(number_value_in_string from (position('1/' in number_value_in_string) + 2) )::numeric 
    ELSE number_value_in_string::numeric 
END ASC, id

Hope this will help someone outhere in the future.