Create loop to create PostgreSQL columns

Question

I have a dataset of 320 columns in a csv file where the header is simply the number of trip.

Each column represents a trip, a route of street names from A to B. (It was a simple list, that I transposed in excel to create the trip numbers as heads.)

I would like to import it to a postgreSQL table.

I saw previous similar question , but as it's only 320, I wonder if that is the best structure and if yes how to loop the column creation in order to insert the data through pgAdmin.

I figured so far this, that returns error message:

DO
$do$
BEGIN 
FOR i IN 1..320 LOOP
   INSERT INTO runs (col_i, col_id) -- use col names
   SELECT i, id
   FROM   tbl;
END LOOP;
END
$do$;

Many thanks

Answer 1

To create a table with 320 text columns:

DO
$$BEGIN
EXECUTE (
   SELECT 'CREATE TABLE my_tbl (c'
        || string_agg(g::text, ' text, c')
        || ' text)'
   FROM generate_series(1,320) g);
END$$;

A sane relational design might be (wild guess, there's not nearly enough information):

CREATE TABLE street (
  street_id serial PRIMARY KEY
, street    text NOT NULL
);

CREATE TABLE trip (
  trip_id  serial PRIMARY KEY
, whatever text
);

CREATE TABLE trip_step (
  trip_id   int REFERENCES trip
, step      int
, street_id int NOT NULL REFERENCES street
, PRIMARY KEY (trip_id, step)
);

Consider: