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By using db<>fiddle, you agree to license everything you submit by Creative Commons CC0. 1926510 fiddles created (21768 in the last week).

create table foo(id integer not null);
 hidden batch(es)


create table bar(id integer constraint nn_bar_id not null);
 hidden batch(es)


select table_name, constraint_name from user_constraints;
TABLE_NAME CONSTRAINT_NAME
FOO SYS_C007864
BAR NN_BAR_ID
 hidden batch(es)


alter table bar drop constraint nn_bar_id;
 hidden batch(es)


select table_name, constraint_name from user_constraints;
TABLE_NAME CONSTRAINT_NAME
FOO SYS_C007864
 hidden batch(es)