CREATE TABLE measurement_y2006m02 PARTITION OF measurement FOR VALUES FROM ('2006-02-01') TO ('2006-03-01') PARTITION BY RANGE (peaktemp); 1. 2. 3. 在创建measurement_y2006m02的分区后,任何插入到measurement_y2006m02的数据(或直接插入到measurement_y2006m02的数据,只要满足其分区约束就可以)将...
ConvertUnits.com provides an online conversion calculator for all types of measurement units. You can find metric conversion tables for SI units, as well as English units, currency, and other data. Type in unit symbols, abbreviations, or full names for units of length, area, mass, pressure,...
In so doing, either the full name of the unit or its abbreviation can be usedas an example, either 'Picogram per milliliter' or 'pg/ml'. Then, the calculator determines the category of the measurement unit of measure that is to be converted, in this case 'Density'. After that, ...
AI检测代码解析 DROP TABLE IF EXISTS measurement; CREATE TABLE measurement ( id int8 null, logdate timestamp not null ) PARTITION BY RANGE (logdate); --创建普通分区 create table m_20230519 partition of measurement for values from ('2023-05-19 00:00:00') to ('2023-05-19 23:59:59');...
这个查询将返回所有继承自measurement表的子表(即分区)。 5. 测试分区功能是否正常工作 最后,需要测试分区功能是否正常工作。可以通过插入数据并查询特定分区来验证。 sql -- 插入数据到父表,数据将自动路由到相应的分区 INSERT INTO measurement (city_id, logdate, peaktemp, unitsales) VALUES (1, '2022-01-...
unitsalesint )PARTITION BY RANGE(logdate); CREATE TABLE measurement_y2006m02 PARTITION OF measurement FOR VALUES FROM('2006-02-01')TO('2006-03-01'); 分区表更具体的一些变化如下: PostgreSQL11: 分区表增加哈希分区 PostgreSQL11:分区表支持创建主键、外键、索引、触发器 ...
Common Unit ConvertersLength, mass, volume, area, temperature, pressure, energy, power, speed and other popular measurement unit converters. Mass Converter In physics, mass, or more specifically inertial mass, is defined as a quantitative measure of an object’s resistance to acceleration. ...
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-- 推荐使用分区键直接创建分区表 CREATE TABLE measurement ( logdate DATE NOT NULL, city_id SERIAL NOT NULL, peaktemp INT, unitsales INT ) PARTITION BY RANGE (logdate); -- 创建具体的分区 CREATE TABLE measurement_y2006m02 PARTITION OF measurement FOR VALUES FROM ('2006-02-01') TO ('2006...
通过指定PARTITION BY子句把measurement表创建为分区表,可选方法有:RANGE、LIST点击查看二者的区别,此处以RANGE为例,以user_id进行分区 CREATE TABLE t_user( user_id int not null, logdate date not null, peaktemp int, unitsales int ) PARTITION BY RANGE (user_id); ...