create table tb1(id integer);
insert into tb1 select generate_series(1,10);
select * from tb1;
delete from
tb1 where id<3;
select * from tb1;

su postgres
psql postgres

postgres=# \i aa.sql (\i /home/postgres/aa.sql)
 id | name 
----+------
 1 | join
 2 | join
 3 | join
 4 | join
 5 | join
 6 | join
 7 | join
 8 | join
 9 | join
 10 | join
(10 rows)
 
CREATE TABLE
INSERT 0 10
 id 
----
 1
 2
 3
 4
 5
 6
 7
 8
 9
 10
(10 rows)
 
DELETE 2
 id 
----
 3
 4
 5
 6
 7
 8
 9
 10
(8 rows)
 
postgres=# 

postgres=# \d tb1 
   Table "public.tb1"
 Column | Type  | Modifiers 
--------+---------+-----------
 id   | integer | 

create function func1()returns void as $$
declare
begin
delete from person where id>5;
delete from tb1 where id>5;
end
$$language plpgsql;
 
select func1();

postgres=# select * from person ;
 id | name 
----+------
 1 | join
 2 | join
 3 | join
 4 | join
 5 | join
 6 | join
 7 | join
 8 | join
 9 | join
 10 | join
(10 rows)
 
postgres=# select * from tb1 ;
 id 
----
 3
 4
 5
 6
 7
 8
 9
 10
(8 rows)

postgres=# \i bb.sql 
CREATE FUNCTION
 func1 
-------
 
(1 row)

postgres=# select * from person ;
 id | name 
----+------
 1 | join
 2 | join
 3 | join
 4 | join
 5 | join
(5 rows)
 
postgres=# select * from tb1 ;
 id 
----
 3
 4
 5
(3 rows)
 
postgres=# 

pslq -d postgres -U postgres -f /home/postgres/aa.sql

psql -d db1 -U userA

\i /pathA/xxx.sql

psql -d db1 -U userA -f /pathA/xxx.sql