mysql recursive(tree) parent child category

Question

I am new in mysql. This is my table:

category table:

id | name        | prent
----------------------------
1  |  os         | null
2  | linux       |         


        

Answer 1

This Thread led me. Thanks to @RolandoMySQLDBA

DELIMITER $$
DROP FUNCTION IF EXISTS `GetAncestry` $$
CREATE FUNCTION `GetAncestry` (GivenID INT) RETURNS VARCHAR(1024)
DETERMINISTIC
BEGIN
    DECLARE rv VARCHAR(1024);
    DECLARE cm CHAR(1);
    DECLARE ch INT;

    SET rv = '';
    SET cm = '';
    SET ch = GivenID;
    WHILE ch > 0 DO
        SELECT IFNULL(`prent`,-1) INTO ch FROM
        (SELECT `prent` FROM Table1 WHERE id = ch) A;
        IF ch > 0 THEN
            SET rv = CONCAT(rv,cm,ch);
            SET cm = ',';
        END IF;
    END WHILE;
    RETURN rv;

END $$
DELIMITER ;

A working fiddle here.

SELECT id,GetAncestry(id) as parents from Table1 where id = 7;

ID  PARENTS
7   6,3,2,1