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By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0. 2805483 fiddles created (40789 in the last week).

create table t(id serial); insert into t default values; insert into t default values;
1 rows affected
1 rows affected
 hidden batch(es)


select ctid , id , (replace(replace(ctid::text,'(','{'),')','}')::integer[])[1] page from t;
ctid id page
(0,1) 1 0
(0,2) 2 0
 hidden batch(es)