MySQL 查询某时间段范围内的数据 补零

 

 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

 

 

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