在5.5版本以前的mysql中Range、List、Hash分区要求分区键必须是int;MySQL5.5及以上,支持非整型的Range 和List分区,即:range columns 和list columns。下面创建一个以非整型创建的List分区 CREATE TABLE user3 ( id INT NOT NULL, name VARCHAR(20), create_time VARCHAR(100) ) PARTITION BY RANGE columns (name...
partition BY RANGE (store_id) ( partition p0 VALUES LESS THAN (6), partition p1 VALUES LESS THAN (11), partition p2 VALUES LESS THAN (16), partition p3 VALUES LESS THAN (21) /* PARTITION p3 VALUES LESS THAN MAXVALUE*/ ); 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13....
分区表:对于非常大的表,可以考虑使用分区表来提高查询性能和管理效率。SQLite 支持通过 CREATE TABLE 语句中的 PARTITION BY 子句来创建分区表。例如: CREATE TABLE sales_data ( id INTEGER PRIMARY KEY, sale_date DATE, amount REAL ) PARTITION BY RANGE (sale_date); 复制代码 在这个例子中,sales_data 表...
CREATE TABLE logs_partitioned ( log_date DATE, message TEXT ) PARTITION BY RANGE (log_date); CREATE TABLE logs_2023 PARTITION OF logs_partitioned FOR VALUES FROM ('2023-01-01') TO ('2024-01-01'); 使用BRIN 索引: CREATE INDEX idx_logs_time ON logs USING brin (log_time);...
CREATE TABLE logs_partitioned ( log_date DATE, message TEXT ) PARTITION BY RANGE (log_date); CREATE TABLE logs_2023 PARTITION OF logs_partitioned FOR VALUES FROM ('2023-01-01') TO ('2024-01-01'); 使用BRIN 索引: CREATE INDEX idx_logs_time ON logs USING brin (log_time); 本文由mdni...
SQL> CREATE TABLE T_NEW (ID NUMBER PRIMARY KEY, TIME DATE) PARTITION BY RANGE (TIME) 2 (PARTITION P1 VALUES LESS THAN (TO_DATE('2005-7-1', 'YYYY-MM-DD')), 3 PARTITION P2 VALUES LESS THAN (MAXVALUE)); 表已创建。 SQL> ALTER TABLE T_NEW EXCHANGE PARTITION P1 WITH TABLE T; ...
WINDOW win1AS(ORDERBYy RANGEBETWEENUNBOUNDED PRECEDINGANDCURRENTROW), win2AS(PARTITIONBYyORDERBYx)ORDERBYx; -- 遇到的问题--- 开窗函数报错,比如rank() over (partiion by ) syntax error 发现版本是旧的 version 2.6 但是运行python, import sqlite3, sqlite3.sqlite_version 显示的是3.21,看网上发布...
PARTITION_SYM: P A R T I T I O N; RANGE_SYM: R A N G E; PRECEDING_SYM: P R E C E D I N G; UNBOUNDED_SYM: U N B O U N D E D; CURRENT_SYM: C U R R E N T; FOLLOWING_SYM: F O L L O W I N G;
Fix a bunch of clazy-range-loop-detach warnings Dec 27, 2021 RemoteDock.h dbhub: Add "Upload Database" action to context menu of local file list Aug 12, 2020 RemoteDock.ui Save some screen space and reduce number of unnecessary borders Aug 8, 2022 RemoteLocalFilesModel.cpp dbhub: When...
WINDOW win1AS(ORDERBYy RANGEBETWEENUNBOUNDEDPRECEDINGANDCURRENTROW),win2AS(PARTITIONBYyORDERBYx)ORDERBYx; WINDOW子句,应当位于HAVING之后,ORDER BY之前。 聚合窗函数 在这个部分我们假设所有的数据库的结构都是: CREATETABLEt1(aINTEGERPRIMARYKEY,b,c);INSERTINTOt1VALUES(1,'A','one'),(2,'B','two'...