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create table tbl (id int); insert into tbl values (3),(4),(5); select count(*) anomaly from ( select id - (lag(id) over (order by id)) diff from tbl ) t where diff is not null and diff <> 1; insert into tbl values (5),(7),(8); select count(*) anomaly from ( select id - (lag(id) over (order by id)) diff from tbl ) t where diff is not null and diff <> 1;

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