要进行范围查询,您需要将此列作为聚类列。
在这种情况下,它将是有效的,导致聚类列存储排序。如果你想搜索数据,你需要指定分区键。
因此,作为一个例子,在这里我使用DEVICE_ID作为分区键:
CREATE TABLE IF NOT EXISTS mykeyspace.device_data (
DEVICE_ID text,
HOURLYTIME TIMESTAMP,
FULLTIME TIMESTAMP,
DATA TEXT,
PRIMARY KEY (DEVICE_ID, HOURLYTIME, FULLTIME)
);
INSERT INTO mykeyspace.device_data (device_id, hourlytime, fulltime, data)
values('Spam machine', '2014-12-12 00:01:00','2014-12-12 00:00:01','Hello World1');
INSERT INTO mykeyspace.device_data (device_id, hourlytime, fulltime, data)
values('Spam machine', '2014-12-12 00:02:00','2014-12-12 00:00:02','Hello World2');
INSERT INTO mykeyspace.device_data (device_id, hourlytime, fulltime, data)
values('Spam machine', '2014-12-12 00:03:00','2014-12-12 00:00:03','Hello World3');
-- Effective range query
SELECT * FROM mykeyspace.device_data
WHERE device_id = 'Spam machine'
AND hourlytime > '2014-12-12 00:00:00'
AND hourlytime < '2014-12-12 00:02:00';
或者另一示例,其中,I白天分区数据(这将导致在集群很好地扩展的数据),并执行范围查询:
CREATE TABLE IF NOT EXISTS mykeyspace.day_data (
DAYTIME timestamp,
HOURLYTIME TIMESTAMP,
FULLTIME TIMESTAMP,
DATA TEXT,
PRIMARY KEY (DAYTIME, HOURLYTIME, FULLTIME)
);
INSERT INTO mykeyspace.day_data (DAYTIME, hourlytime, fulltime, data)
values('2014-12-12', '2014-12-12 00:01:00','2014-12-12 00:00:01','Hello World1');
INSERT INTO mykeyspace.day_data (DAYTIME, hourlytime, fulltime, data)
values('2014-12-12', '2014-12-12 00:02:00','2014-12-12 00:00:02','Hello World2');
INSERT INTO mykeyspace.day_data (DAYTIME, hourlytime, fulltime, data)
values('2014-12-12', '2014-12-12 00:03:00','2014-12-12 00:00:03','Hello World3');
SELECT * FROM mykeyspace.day_data
WHERE daytime = '2014-12-12'
AND hourlytime > '2014-12-12 00:00:00'
AND hourlytime < '2014-12-12 00:02:00';
有一个关于时间序列数据上PlanetCassandra
非常有用的文章,你可以尝试> 2014-12-12 00:00:00&<2014-12-12 23:59:59 ... –