Mysql 将日期区间转为日期列表

SELECT
		DATE_FORMAT ( DATE_ADD ( '${satrtDate}', INTERVAL seq.seq DAY ), '%Y-%m-%d' ) AS DATE,
	FROM
		(
		SELECT
			( t2.i + t1.i * 10 + t0.i * 100 ) AS seq 
		FROM
			(
			SELECT
				0 AS i UNION ALL
			SELECT
				1 UNION ALL
			SELECT
				2 UNION ALL
			SELECT
				3 UNION ALL
			SELECT
				4 UNION ALL
			SELECT
				5 UNION ALL
			SELECT
				6 UNION ALL
			SELECT
				7 UNION ALL
			SELECT
				8 UNION ALL
			SELECT
				9 
			) AS t0,
			(
			SELECT
				0 AS i UNION ALL
			SELECT
				1 UNION ALL
			SELECT
				2 UNION ALL
			SELECT
				3 UNION ALL
			SELECT
				4 UNION ALL
			SELECT
				5 UNION ALL
			SELECT
				6 UNION ALL
			SELECT
				7 UNION ALL
			SELECT
				8 UNION ALL
			SELECT
				9 
			) AS t1,
			(
			SELECT
				0 AS i UNION ALL
			SELECT
				1 UNION ALL
			SELECT
				2 UNION ALL
			SELECT
				3 UNION ALL
			SELECT
				4 UNION ALL
			SELECT
				5 UNION ALL
			SELECT
				6 UNION ALL
			SELECT
				7 UNION ALL
			SELECT
				8 UNION ALL
			SELECT
				9 
			) AS t2 
		) AS seq 
	WHERE
		seq.seq <= DATEDIFF( '${endDate}', '${satrtDate}' ) 
	ORDER BY
	seq.seq 

方式二：创建视图

CREATE VIEW v_digits AS
  SELECT 0 AS digit UNION ALL
  SELECT 1 UNION ALL
  SELECT 2 UNION ALL
  SELECT 3 UNION ALL
  SELECT 4 UNION ALL
  SELECT 5 UNION ALL
  SELECT 6 UNION ALL
  SELECT 7 UNION ALL
  SELECT 8 UNION ALL
  SELECT 9;

CREATE VIEW v_numbers AS
  SELECT
    ones.digit + tens.digit * 10 + hundreds.digit * 100 + thousands.digit * 1000 AS number
  FROM
    v_digits as ones,
    v_digits as tens,
    v_digits as hundreds,
    v_digits as thousands;
		
-- 生成的日期格式为  yyyy-MM-dd		
CREATE VIEW v_dates AS
  SELECT
    SUBDATE(CURRENT_DATE(), number) AS date
  FROM
    v_numbers
  UNION ALL
  SELECT
    ADDDATE(CURRENT_DATE(), number + 1) AS date
  FROM
    v_numbers;

-- 生成的日期格式为 yyyy-MM
CREATE VIEW v_months AS
  SELECT
    DATE_FORMAT(SUBDATE(CURRENT_DATE(), INTERVAL number MONTH),'%Y-%m')  AS date
  FROM
    v_numbers
  UNION ALL
  SELECT
    DATE_FORMAT(ADDDATE(CURRENT_DATE(), INTERVAL number+1 MONTH),"%Y-%m") AS date
  FROM
    v_numbers;

创建日期视图之后直接查询视图

SELECT
  date
FROM
  v_dates
WHERE
  date BETWEEN '2020-01-20' AND '2021-01-24'
ORDER BY
  date asc 

借助help_topic表

SELECT
	date_format( date_sub( '20220810', INTERVAL ( @i := @i - 1 ) DAY ), '%Y%m%d' ) AS days 
FROM
	mysql.help_topic
	JOIN ( SELECT @i := 1 ) c 
WHERE
	help_topic_id <= (
	TIMESTAMPDIFF( DAY, '20220810', '20220820' ))