要映射它们，您必须不是在true上加入，而是在不同的行上加入。
这是示例如何在id上同时加入两者with ordinality-希望能有所帮助。根据您的json样本
t=# with j as (select '{"name":"john", "cars":["bmw X5 xdrive","volvo v90 rdesign"], "brands":["bmw","volvo"]}'::json d)
select car,brand,t1.id from j
join json_array_elements_text(j.d->'cars') with ordinality t1(car,id) on true
join json_array_elements_text(j.d->'brands') with ordinality t2(brand,id) on t1.id = t2.id
;
car | brand | id
-------------------+-------+----
bmw X5 xdrive | bmw | 1
volvo v90 rdesign | volvo | 2
(2 rows)
OP的详细说明：
您可以通过汇总em然后使用index来避免映射多个行：
create or replace function test_func(d json)
returns void as $$
begin
with j as (select d)
, a as (
select car,brand,t1.id oid
from j
join json_array_elements_text(j.d->'cars') with ordinality t1(car,id) on true
join json_array_elements_text(j.d->'brands') with ordinality t2(brand,id) on t1.id = t2.id
)
, n as (
insert into t1 (name) values (d::json -> 'name') returning id
), c as (
insert into t2 (cars) select car from a order by oid returning id
)
, ag as (
select array_agg(c.id) cid from c
)
insert into t3 (id, name_id, cars_id, brand)
select 1, n.id,cid[oid], brand
from a
join n on true
join ag on true
;
end;
$$ language plpgsql;
CREATE TABLE t1 ( "id" SERIAL PRIMARY KEY, "name" text NOT NULL );
CREATE TABLE t2 ( "id" SERIAL PRIMARY KEY, "cars" text NOT NULL );
CREATE TABLE t3 ( "id" int, "name_id" int REFERENCES t1(id), "cars_id" int REFERENCES t2(id), "brand" text );
t=# select test_func('{"name":"john", "cars":["bmw X5 xdrive","volvo v90 rdesign"], "brands":["bmw","volvo"]}');
test_func
-----------
(1 row)
t=# select * from t1;
id | name
----+--------
14 | "john"
(1 row)
t=# select * from t2;
id | cars
----+-------------------
27 | bmw X5 xdrive
28 | volvo v90 rdesign
(2 rows)
t=# select * from t3;
id | name_id | cars_id | brand
----+---------+---------+-------
1 | 14 | 27 | bmw
1 | 14 | 28 | volvo
(2 rows)
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