I have s_no in my database's table. Which is increment automatically whenever new entry comes. But this is only int. I am using this as a ID of particular task. I want this in varchar. means id should be like "a45c725". How to achive this

You may want to add an additional column for this, and create an insert trigger to automatically generate that id (based on your specifications).

to use that as id . Jump to next page using this id and show detail according to that.

Is this a new question? Can you please give an example of what you want?

I have a one field in table says s_no (int) 20. I am using this as a user id. its automatic increment when new entry comes. This s_no is user to get other detail of user. But this is integer so i am getting only limited user. How to get varchar id which will be automatic increment.