php - Mysql, finding missing numbers in a sequence -


this question has answer here:

i have huge table couple hundred thousand records. have unique id first column though missing in sequence of numbers.

i trying show list of numbers missing individually.

so example:

10029 10032 10034 10036

i trying show:

10030 10031 10033 10035

i found query seems missing numbers when there's range:

select t1.id+1 missing  data t1  left join data t2      on t1.id+1 = t2.id  t2.id null

result:

10030 10033

as can see, 10031 , 10035 missing list.

perhaps starting point. not tested, might work

select @min := (select min(id) yourtable); // smallest id in table select @last := @min; // cache min value clause  select id, id - @last difference, @last := id yourtable id > @min order id asc having difference > 1

it won't give individual missing ids, it'll tell gaps are, , how big are.


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