Question

I have a MYSQL table which stores teams.

Table structure:
CREATE TABLE teams (
id int(11) NOT NULL AUTO_INCREMENT,
name varchar(28) COLLATE utf8_unicode_ci NOT NULL,
UNIQUE KEY id (id)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=1;

Sample data:
INSERT INTOteamsVALUES
(1, 'one'),
(2, 'two'),
(3, 'three'),
(4, 'four'),
(5, 'five');

Use:
SELECT id, name, id as rowNumber FROM teams WHERE id = 4
Returns the correct rowNumber, as there are really three rows infront f it in the table. But this only works as long as I don’t remove a row.

Example:
Let’s say I DELETE FROM teams WHERE id = 3;
When I now use SELECT id, name, id as rowNumber FROM teams WHERE id = 4 the result is wrong as there are now only two rows (id’s 1&2) infront of it in the table.

How can I get the “real” row number/index ordered by id from one specific row?

Answer 1

You are rturning ID as rowNumber, so it simply returning ID column value. Why do you expect it to be different?

I think you may want to define and @curRow variable to get the row number as and use sub query as below:

 SELECT * from 
    (SELECT  ID, 
         NAME, 
         @curRow := @curRow + 1 AS rowNumber
      FROM    Teams t
      JOIN    (SELECT @curRow := 0) curr
      ORDER by t.ID asc) as ordered_team
 WHERE ordered_team.id = 4;