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create table t1 (a int primary key);
begin;
insert into t1 values (1);
savepoint A;
insert into t1 values (2);
select count(*) from t1;
count(*)
2
rollback to savepoint A;
select count(*) from t1;
count(*)
1
commit;
select count(*) from t1;
count(*)
1
begin;
insert into t1 values (2);
insert into t1 values (3);
savepoint A;
insert into t1 values (4);
insert into t1 values (5);
savepoint B;
insert into t1 values (6);
savepoint C;
insert into t1 values (7);
rollback to savepoint A;
select count(*) from t1;
count(*)
3
commit;
drop table t1;
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