Insert data in multiple tables at a time with repeated values - sql

Question

I have to insert data into first and second table directly. But the third table which I received data as array and inserted into 3rd table as same.
In my 3rd table values will be repeated. Ex:
values:
{name=ff,age=45,empid=23,desig=se,offid=1,details=kk,offid=2,details=aa,offid=3,details=bb,offid=4,details=cc}
So using 2nd table userid as same for all the offid, but details and other columns are different
#My issue is i will get single hit but i need to iterate for 3rd table.
with first_insert as (
insert into sample(name,age)
values(?,?)
RETURNING id
),
second_insert as (
insert into sample1(empid,desig)
values((select id from first_insert),?)
RETURNING userid
)
insert into sample2(offid,details)
values((select userid from second_insert),?)
Is this available or possible in PostgreSQL?

Answer 1

Yes, absolutely possible.
You can join rows from CTEs to VALUES expressions to combine them for a new INSERT in a data-modifying CTE. Something like this:
WITH first_insert AS (
INSERT INTO sample(name,age)
VALUES (?,?)
RETURNING id
)
, second_insert AS (
INSERT INTO sample1(empid, desig, colx)
SELECT i1.id, v.desig, v.colx
FROM first_insert i1
, (VALUES(?,?)) AS v(desig, colx)
RETURNING userid
)
INSERT INTO sample2(offid, details, col2, ...)
SELECT i2.userid, v.details, ...
FROM second_insert i2
, (VALUES (?,?, ...)) AS v(details, col2, ...);