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First off, gaps in a sequence are to be expected. Ask yourself if you really need to remove them. Your life gets simpler if you just live with it. To get gap-less numbers, the (often better) alternative is to use a VIEW with row_number(). Example in this related answer: Gap-less sequence where multiple transactions with multiple tables are involved Here ...


3

You could write your own user-defined function to generate sequence numbers. Alternatively, you could create a separate table with a single AUTO_INCREMENT column to generate new IDs: in your stored procedure you would insert a row into that table, use LAST_INSERT_ID() to fetch the generated value, then delete the inserted row.



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