-- 生成連續數值(0-9)
WITH x AS
    (SELECT 0 AS id UNION ALL
    SELECT id + 1 AS id
    FROM x
    WHERE id < 9)
SELECT *
FROM x;

-- 生成連續字母(a-z)
WITH x AS
    (SELECT 1 AS id UNION ALL
    SELECT id + 1 AS id
    FROM x
    WHERE id < 26)
SELECT CHAR(id+96) AS id
FROM x;

-- 生成連續字元(0-9,a-z)
WITH
 
 x AS
    (SELECT 0 AS id,CHAR(ascii('0')) AS cc UNION ALL
    SELECT id + 1 AS id,CASE WHEN id<9 THEN CHAR(ascii('1')+id) ELSE CHAR(ascii('a')+id-9) END AS cc
    FROM x
    WHERE id < 35)
SELECT id, cc
FROM x;