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By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0. 2249204 fiddles created (32162 in the last week).

select version();
version
PostgreSQL 12.0 (Debian 12.0-1.pgdg90+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 6.3.0-18+deb9u1) 6.3.0 20170516, 64-bit
 hidden batch(es)


create table t (a int);
 hidden batch(es)


insert into t (a) values (1) ;
1 rows affected
 hidden batch(es)


insert into t (a) values (2) ;
1 rows affected
 hidden batch(es)


insert into t (a) values (3) ;
1 rows affected
 hidden batch(es)


insert into t (a) values (5) ;
1 rows affected
 hidden batch(es)


select count(*) as c from t group by () ;
c
4
 hidden batch(es)