我对 mysql 查询有些困惑。任何帮助表示赞赏。
我当前的查询:
SELECT
r.name
, r.network
, i.name
, d.dtime
, d.input
FROM router AS r
INNER JOIN interface AS i
ON r.rid = i.rid
INNER JOIN 1273118400_1_60 AS d
ON i.id = d.id
AND dtime BETWEEN 1273152000 AND 1273153800 WHERE i.status = "active"
现在我使用 Unix_Timestamp 作为我查询的时间间隔。 现在我得到的结果是: 1273152000、1273152001、1273152002等。
我想以 60 秒的间隔获取,例如: 1273152000、1273152060、1273152120等。
知道我该怎么做吗????
请帮忙。 谢谢,
吉利卡
最佳答案
我不确定它是否可以进一步简化,但您可能想尝试以下操作:
SELECT r.name,
r.network,
i.name,
d.dtime,
d.input
FROM router AS r
INNER JOIN interface AS i ON (r.rid = i.rid)
INNER JOIN (
SELECT t.dtime, dt.input, dt.id
FROM 1273118400_1_60 AS t
INNER JOIN (
SELECT dtime, id, input
FROM 1273118400_1_60
) AS dt ON (dt.dtime = t.dtime AND dt.id = t.id)
GROUP BY t.dtime DIV 60
) AS d ON (i.id = d.id)
WHERE (d.dtime BETWEEN 1273152000 AND 1273153800) AND
(i.status = 'active');
测试用例:
CREATE TABLE router (rid int, name varchar(20), network int);
CREATE TABLE interface (id int, rid int, status varchar(20), name varchar(10));
CREATE TABLE 1273118400_1_60 (id int, dtime int, input int);
INSERT INTO router VALUES (1, 'router A', 0);
INSERT INTO interface VALUES (1, 1, 'active', 'interface A');
INSERT INTO 1273118400_1_60 VALUES (1, 1273151999, 1);
INSERT INTO 1273118400_1_60 VALUES (1, 1273152000, 2);
INSERT INTO 1273118400_1_60 VALUES (1, 1273152001, 3);
INSERT INTO 1273118400_1_60 VALUES (1, 1273152002, 4);
INSERT INTO 1273118400_1_60 VALUES (1, 1273152059, 5);
INSERT INTO 1273118400_1_60 VALUES (1, 1273152060, 6);
INSERT INTO 1273118400_1_60 VALUES (1, 1273152061, 7);
INSERT INTO 1273118400_1_60 VALUES (1, 1273152062, 8);
INSERT INTO 1273118400_1_60 VALUES (1, 1273152119, 9);
INSERT INTO 1273118400_1_60 VALUES (1, 1273152120, 10);
INSERT INTO 1273118400_1_60 VALUES (1, 1273152121, 11);
结果:
+----------+---------+-------------+------------+-------+
| name | network | name | dtime | input |
+----------+---------+-------------+------------+-------+
| router A | 0 | interface A | 1273152000 | 2 |
| router A | 0 | interface A | 1273152060 | 6 |
| router A | 0 | interface A | 1273152120 | 10 |
+----------+---------+-------------+------------+-------+
3 rows in set (0.00 sec)
关于sql - MySQL 在特定时间间隔查询行,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/3406714/