Check out example codes for "sql reset auto increment". It will help you in understanding the concepts better.

Code Example 1

ALTER TABLE tmp AUTO_INCREMENT = 3;

Code Example 2

SET  @num := 0;

UPDATE your_table SET id = @num := (@num+1);

ALTER TABLE your_table AUTO_INCREMENT =1;

Code Example 3

ALTER TABLE table_name AUTO_INCREMENT = 1;

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