How to generate auto increment field in select query

Question

For example I have a table with 2 columns, first_name and last_name with these values

Ali           Khani
Elizabette    Amini
Britn         


        

Answer 1

here's for SQL server, Oracle, PostgreSQL which support window functions.

SELECT  ROW_NUMBER() OVER (ORDER BY first_name, last_name)  Sequence_no,
        first_name,
        last_name
FROM    tableName

• SQLFiddle Demo