在RANGE和LIST分区中,必须明确指定一个给定的列值或列值集合应该保存在哪个分区中。 create table foo_hash (empno varchar(20) not null , empname varchar(20), deptno int, birthdate date not null, salary int ) partition by hash(year(birthdate)) partitions 4; 以上创建了4个分区。 (4)Key分区: ...
1.分表与表分区的区别 1.1 关于分表 分表是将一个大表分为几个或是多个小表,例如:table_1每天有1Kw的数据量,table_1随便时间的增长会越来越大,最终达到mysql表的极限,在这种比较极端的情况下 我们可以考虑对table_01进行分表操作,即每天生成与table_1表同样的表,每天一张即table_1_20120920 更多详细:http:...
SQL Server 2008 treats it not as a single column index on T(A), but rather as a multi-column or composite index on T([PtnId],A). Note that the table and index are still stored physically as partitioned tables. In this example, the table and non-clustered index are decomposed into ...
以下步骤演示了如何在SQL Server 2008 Management Studio中通过向导完成创建分区表的过程。当然,你也可以通过脚本来完成这些功能。 1. 在SQL Server 2008 Management Studio中选择你想要创建分区表的对象,右键点击表名选择Storage –> Create Partition. 2. 在出现的Create Partition Wizard中点击Next按钮进入Select a Pa...
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在Spark SQL中,我们可以使用CREATE TABLE语句创建分区表。以下是一个简单的示例,创建一个按“日期”分区的销售数据表: CREATETABLEsales_data(product_idINT,quantityINT,priceDOUBLE)PARTITIONEDBY(sale_date STRING)STOREDASPARQUET; 1. 2. 3. 4. 5. ...
1mysql>CREATETABLEusers2(3"id"int(10) unsignedNOTNULL,4"name"varchar(100)DEFAULTNULL,5"birth"datetime6) ENGINE=InnoDBDEFAULTCHARSET=utf8;7Query OK,0rows affected 3.1.2 分表语句 1mysql>createtableusers_part2(3"id"int(10) unsignedNOTNULL,4"name"varchar(100)DEFAULTNULL,5"birth"datetime6) ...
创建分区表的SQL语句示例如下。 示例1:在public schema下创建不带主键的分区父表和对应的分区子表。 V2.1版本起支持的语法: BEGIN;CREATETABLEpublic.hologres_parent ( a text, bint, ctimestamp, d text )PARTITIONBYLIST (a)WITH(orientation='column');CREATETABLEpublic.hologres_child1PARTITIONOFpublic.holo...
INSERTINTOsrcPARTITION(e=201312)VALUES(1,100.1),(2,100.2),(3,100.3);--创建目标表parttable。CREATETABLEparttable(aINT, bDOUBLE) PARTITIONEDBY(p STRING);--将源表src数据插入目标表parttable。SETodps.sql.allow.fullscan=true;INSERTINTOparttablePARTITION(p)SELECTc, d,CURRENT_TIMESTAMP()FROMsrc;-...
CREATE TABLE simple_customer ( id INT NOT NULL PRIMARY KEY, full_name VARCHAR(40) ) PARTITION BY KEY() PARTITIONS 2; Need a good GUI tool for databases?TablePlusprovides a native client that allows you to access and manage Oracle, MySQL, SQL Server, PostgreSQL, and many other databases si...