Question

I write a query and give a table in output but I want to every row of my table has a number automatically that starts from 1. for example , I want that my table has “number” column that first row of my table have 1 in that column , second row of my table have 2 in that column , third row of my table have 3 in that column , …
How can I do this ?
thanks

** My DBMS is MySQL **

Answer 1

Use a variable and increment it like following.

set @num:=0; 
select *,  @num:=@num+1 `Row` from names;

---

Example

mysql> create table names( name varchar(10) primary key )engine=Innodb charset=utf8 collate utf8_general_ci;
Query OK, 0 rows affected (0.09 sec)

mysql> insert into names values('a'), ('b'), ('cat'), ('dog'), ('parrot'), ('bird');
Query OK, 6 rows affected (0.04 sec)
Records: 6  Duplicates: 0  Warnings: 0

mysql> set @num:=0; select *,  @num:=@num+1 `Row` from names;
Query OK, 0 rows affected (0.00 sec)

+--------+------+
| name   | Row  |
+--------+------+
| a      |    1 |
| b      |    2 |
| bird   |    3 |
| cat    |    4 |
| dog    |    5 |
| parrot |    6 |
+--------+------+
6 rows in set (0.00 sec)

Note: If you use * make sure it precedes.