Although this solution is for small numbers .
Sometime it happens that some sequence number miss and you need to find out the missing sequence to do that first create a table with name of sequence and with one column name id and insert the numbers in my case i have number from 1-25 .
So now i have one table with name sequence which has column id and value 1-25 .
Now to find missing number of other table use this query ;
select id from sequence where id not in (select id from other_table) ;
Thats it .
