CREATE TABLE test(p1,p2,p3,c1,c2,c3,primary key(p1,p2,p3))/其中p1,p2,p3为联合主键 SELECT*FROM test WHERE p1=?ORDER BY p2/该SQL支持ORDER BY SELECT*FROM test WHERE p1=?and p2=?ORDER BY p3/该SQL支持ORDER BY SELECT*FROM test ...
本文介绍Mesh模型在OGC SF标准模型的基础上新增的数据模型。...TRIANGLEFAN TriangleFan基于连续的点来描述多面体系统，如以下多面体：可以分别使用顶点坐标串(p1,p2,p3,p4,p5)来描述三个三角面(p1,p2,p3),(p1,p3,p4),(p1,p4,p5)。
本文介绍Mesh模型在OGC SF标准模型的基础上新增的数据模型。...TRIANGLEFAN TriangleFan基于连续的点来描述多面体系统，如以下多面体：可以分别使用顶点坐标串(p1,p2,p3,p4,p5)来描述三个三角面(p1,p2,p3),(p1,p3,p4),(p1,p4,p5)。
创建 LIST-RANGE 类型的二级分区表 tenants，在 p0 的所有二级分区以及 p1 的 p1_1、p1_2 和 p1_3 分区上创建部分索引 ind_id，在 p0 的 p0_1 和 p0_2 分区以及 p1 的 p1_1 和 p1_2 分区上创建部分索引 ind_date。CREATE TABLE tenants(id ...
默认4个一级分区的分区名称分别是p1、p2、p3、p4，这个表一共有12个二级分区，分别是：p1sp1，p2sp1，p3sp1，p4sp1 p1sp2，p2sp2，p3sp2，p4sp2 p1sp3，p2sp3，p3sp3，p4sp3 重命名p1为p10：alter table tb1 rename partition p1 to p10 ...
返回结果：+-+-+-+-+-+-+|TABLE_SCHEMA|TABLE_NAME|COLUMN_NAME|TYPE|IS_PRIMARY_KEY|SORT_ORDER|+-+-+-+-+-+-+|test1|t1|hash32[p1]|INT|true|ASC|test1|t1|p1|BIGINT|true|ASC|test1|t1|p2|INT|true|ASC|test1|t1|c1|INT|false|none|test...
默认地，4个一级分区的分区名称分别是p1、p2、p3、p4，这个表一共有12个二级分区，分别是：p1sp1，p2sp1，p3sp1，p4sp1 p1sp2，p2sp2，p3sp2，p4sp2 p1sp3，p2sp3，p3sp3，p4sp3 可以迁移整个分区模板，例如：alter table tb1 move ...
which are named P1,P2,and P3 in sequence,this function calculates the angle clockwise from P1 to P2 and then to P3.ST_Angle(P1,P2,P3)=ST_Angle(P2,P1,P2,P3)If you specify four points,which are named P1,P2,P3,and P4 in ...
which are named P1,P2,and P3 in sequence,this function calculates the angle clockwise from P1 to P2 and then to P3.ST_Angle(P1,P2,P3)=ST_Angle(P2,P1,P2,P3)If you specify four points,which are named P1,P2,P3,and P4 in ...
which are named P1,P2,and P3 in sequence,this function calculates the angle clockwise from P1 to P2 and then to P3.ST_Angle(P1,P2,P3)=ST_Angle(P2,P1,P2,P3)If you specify four points,which are named P1,P2,P3,and P4 in ...
Example CREATE TABLE hash_partitions_sales(deptno NUMBER,deptname VARCHAR(32))PARTITION BY HASH(deptno)(PARTITION p1,PARTITION p2,PARTITION p3,PARTITION p4,PARTITION p5);ALTER TABLE hash_partitions_sales RENAME PARTITION p...
Example CREATE TABLE hash_partitions_sales(deptno NUMBER,deptname VARCHAR(32))PARTITION BY HASH(deptno)(PARTITION p1,PARTITION p2,PARTITION p3,PARTITION p4,PARTITION p5);ALTER TABLE hash_partitions_sales RENAME PARTITION p...
生成逻辑计划 EXPLAIN WITHOUT IMPLEMENTATION FOR SELECT POSITION('9378' IN p1)AS lp,COUNT(c1)FROM(SELECT*FROM test WHERE p1 like '3_%')GROUP BY lp ORDER BY lp;生成类型计划 EXPLAIN WITH TYPE FOR SELECT POSITION('9378...
UPSERT语法是INSERT与UPDATE的结合体，表示行存在时执行UPDATE语法，不存在时执行INSERT。执行UPSERT的时候必须指定完全的primary key的...再写入同一行的其他列 批量写入 UPSERT INTO dt(p1,p2,c1,c2)VALUES(1,2,3,4),(2,3,4,5),(3,4,5,6);
2022)(SUBPARTITION p0sp0 VALUES LESS THAN(2020),SUBPARTITION p0sp1 VALUES LESS THAN(2022)),PARTITION p1 VALUES IN(2021,2023)(SUBPARTITION p1sp0 VALUES LESS THAN(2021),SUBPARTITION p1sp1 VALUES LESS THAN(2023),SUBPARTITION ...
without the need for you to perform a VACUUM operation.Example Truncate the p1 partition.CREATE TABLE hash_partitions_sales(deptno NUMBER,deptname VARCHAR(32))PARTITION BY HASH(deptno)(PARTITION p1,PARTITION p2,PARTITION p...
without the need for you to perform a VACUUM operation.Example Truncate the p1 partition.CREATE TABLE hash_partitions_sales(deptno NUMBER,deptname VARCHAR(32))PARTITION BY HASH(deptno)(PARTITION p1,PARTITION p2,PARTITION p...
可以通过以下SQL将p1分裂成p10、p11、p12（意味着tb1和tb2的分区p1会被同步的分裂成p10、p11、p12）：ALTER TABLEGROUP mytg1 SPLIT PARTITION p1 INTO(PARTITION p10 VALUES IN(1,3,5),PARTITION p11 VALUES IN(2,4),PARTITION p12 VALUES...
2022)(SUBPARTITION p0sp0 VALUES LESS THAN(2020),SUBPARTITION p0sp1 VALUES LESS THAN(2022)),PARTITION p1 VALUES IN(2021,2023)(SUBPARTITION p1sp0 VALUES LESS THAN(2021),SUBPARTITION p1sp1 VALUES LESS THAN(2023),SUBPARTITION ...
热数据5000万/usr/pgsql-11/bin/pgbench-M prepared-v-r-P 1-f./ro.sql-c 16-j 16-T 120-D scale=5000-D range=50000000 总数据量5亿，热数据1亿/usr/pgsql-11/bin/pgbench-M prepared-n-r-P 1-f./ro.sql-c 16-j 16-T 120-D scale=5000-D ...
热数据5000万/usr/pgsql-11/bin/pgbench-M prepared-v-r-P 1-f./ro.sql-c 32-j 32-T 120-D scale=5000-D range=50000000 总数据量5亿，热数据1亿/usr/pgsql-11/bin/pgbench-M prepared-n-r-P 1-f./ro.sql-c 32-j 32-T 120-D scale=5000-D ...
创建列存索引idx3 CREATE INDEX IF NOT EXISTS idx3 USING COLUMNAR ON test(p1,p2,c1,c2,c3)PARTITION BY ENUMERABLE(p1,p2,bucket(128,p1,p2));删除二级索引 执行以下语句，禁用二级索引idx1。ALTER INDEX IF EXISTS idx1 ON test ...
AppSwitch(des="枚举类型开关",level=Level.p1)public static EnumType enumTypeSwitch=EnumType.ITEM1;AppSwitch(des="泛型为List Integer 的LinkedList",level=Level.p1)public static List List Integer LIST_INT_LINKEDLIST=new ...
segments:6)-Append-Hash Join Hash Cond:(t2_p1.id=t3_p1.id)-Partial Seq Scan on t2_p1-Hash-Full Seq Scan on t3_p1-Hash Join Hash Cond:(t2_p2.id=t3_p2.id)-Partial Seq Scan on t2_p2-Hash-Full Seq Scan on t3_p2-Hash Join Hash ...