1.创建基础表
CREATE TABLE num (i INT);
INSERT INTO num (i) VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
2.查询时间范围
SELECT
adddate('2015-11-25', numlist.id) AS 'date'
FROM
(
SELECT
n1.i + n10.i * 10 + n100.i * 100 AS id
FROM
num n1
CROSS JOIN num AS n10
CROSS JOIN num AS n100
) AS numlist
WHERE
adddate('2015-11-25', numlist.id) <= '2015-12-25';
3 创建数据表
create table datatable(tDate char(10) PRIMARY KEY,tCount int(3)); insert into datatable(tDate,tCount)values
('2015-11-24',23),('2015-11-25',1),
('2015-11-26',21),('2015-11-28',17),
('2015-11-29',13),('2015-12-01',5),
('2015-12-02',11),('2015-12-04',8),
('2015-12-05',3),('2015-12-07',29),
('2015-12-09',80),('2015-12-10',24)
4 查询 （无值时补零）
SELECT
a.date,
COALESCE (b.tcount, 0) count
FROM
(
SELECT
adddate('2015-11-25', numlist.id) AS 'date'
FROM
(
SELECT
n1.i + n10.i * 10 + n100.i * 100 AS id
FROM
num n1
CROSS JOIN num AS n10
CROSS JOIN num AS n100
) AS numlist
WHERE
adddate('2015-11-25', numlist.id) <= '2015-12-25'
) a
LEFT JOIN datatable b ON a.date = b.tDate
好 查看结果
#------------完