how can I insert data by declaring all fields (not *)? - postgresql

Question

Here's my insert query:
INSERT INTO listing_replica_child (
(
SELECT rtz_comma_list(column_name)
FROM information_schema.columns
WHERE table_name = 'listing'
)
)
VALUES (
(
SELECT (
(
SELECT rtz_comma_list(column_name)
FROM information_schema.columns
WHERE table_name = 'listing'
)
FROM listing
WHERE listing_id = 9656
)
)
);
I'm using postgres.

Answer 1

do $$
DECLARE rec TEXT;
BEGIN
SELECT 'insert into listing_replica_child (' || t.col || ') select * from listing WHERE listing_id = 9656 '
INTO rec
FROM (
SELECT string_agg(column_name, ',') col
FROM information_schema.columns
WHERE table_name = 'listing'
) t;
EXECUTE rec;
END;$$;
You can wrap this dynamic query into a function like this
CREATE OR replace FUNCTION insert_listing_replica_child (_listing_id INT)
RETURNS void AS $$
DECLARE rec TEXT;
BEGIN
SELECT 'insert into listing_replica_child (' || t.col || ') select * from listing WHERE listing_id = ' || _listing_id || ' '
INTO rec
FROM (
SELECT string_agg(column_name, ',') col
FROM information_schema.columns
WHERE table_name = 'listing'
) t;
EXECUTE rec;
END $$
LANGUAGE plpgsql
So if want to insert values from listing table with lissting_id=9656 into table listing_replica_child
just Call
select insert_listing_replica_child (9656)

Answer 2

The way to specify all destination fields is to omit the column list entirely.
Your attempt then becomes:
INSERT INTO listing_replica_child
SELECT * FROM listing
WHERE listing_id = 9656
without loss of intention: If the number and type of the fields of the tables differs with your attempt, execution will explode (as will this query).
Even though you have asked that * not be used, it is the simplest and best way to achieve the task.