Incrementing a field in SQL using PHP

Question

I have a table (T1) with some fields F2, F3 (Columns) with already some values in it .... .

I need to add a new field (F1) to the table (T1) and F1 will be the primary k

Answer 1

If you are using MySQL:

ALTER TABLE myTable
AUTO_INCREMENT = 1677216 ,
ADD COLUMN F1 INT PRIMARY KEY AUTO_INCREMENT ;

Existing rows will have the F1 field automatically filled with ids, starting from 1677216.

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If you are worried that it is an integer and not a string, pretend it's a string by never using id, only use RIGHT(id,8)