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create table t (
user_id int, value_1 int, value_2 int
);
insert into t
values
(99, 50, 1),
(99, 50, 1),
(100, 50, 1),
(100, 50, 2),
(101, 50, 1),
(101, 50, 1),
(101, 50, 2),
(101, 50, 2),
(102, 50, 2),
(102, 50, 3);
select
ctid, *
from
t;
with t1 as(
SELECT ctid, user_id, value_1, value_2, ROW_NUMBER () OVER (partition by user_id, value_1 ORDER BY value_2) AS row_num
FROM t
)
delete from t using t1 where (t.ctid = t1.ctid and t1.row_num > 1);
select
ctid, *
from
t;
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