Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
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create table t (
user_id int, value_1 int, value_2 int
);
insert into t
values
(100, 50, 1),
(100, 50, 2),
(101, 50, 1),
(101, 50, 2),
(102, 50, 2),
(102, 50, 3),
(103, 50, 1),
(103, 50, 1);
select
*
from
t;
SELECT user_id, value_1, value_2, ROW_NUMBER () OVER (partition by user_id, value_1 ORDER BY value_2) AS row_num
FROM t group by user_id, value_1, value_2;
with t1 as(
SELECT 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 t1.user_id = t.user_id and t1.value_1 = t.value_1 and t1.value_2 = t.value_2 and t1.row_num>1;
select
*
from
t;
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