Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
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create table tbl (id int primary key);
insert into tbl values (3),(4),(5);
select count(*) 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 (7),(8);
select count(*) 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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