Question

I have been trying to run this query to select a row by its row number but I keep getting unknown column ‘row’ in where clause. Is this query possible

SELECT @row := @row + 1 AS row, pi.*
FROM ci_patient_info pi
where row = 2

Answer 1

Wrap it in a subquery

SELECT c.*
FROM
   (
      SELECT @row := @row + 1 AS row, pi.*
      FROM ci_patient_info pi
   ) c
where c.row = 2

UPDATE 1

maybe your subquery should look like this,

  SELECT @row := @row + 1 AS row, pi.*
  FROM ci_patient_info pi, (SELECT @row:=0) x