How to update the id column starting from 1 again

Question

I am having problem to update the list of id number again starting from 1,2,3,4,5. Since I have deleted few records as I was testing the sql commands. Can you please help on how

Answer 1

The easiest (and sometimest fastest) way is to remove column and add it back. Updating column may screw up indexes or make a mess with values. Droping whole table got no sense. But remember that if other columns refer to that ids you can damage your app.