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: ...
into table tablename partition(分区字段1='分区值1', 分区字段2='分区值2'...); 1. 2. 直接将文件数据导入到分区表。其实就是将文件导入对应的文件夹下 例子: load data local inpath '/root/hivedata/archer.txt' into table t_all_hero_part partition(role='sheshou'); load data local inpath '...
create table part_range_list ( id bigint not null auto_increment, ftime datetime, str text, primary key(id,ftime) )engine=myisam partition by list (id) ( partition p0 values in (0,1), partition p1 values in (2,4) ) –5.5之后的mysql说可以支持字符目前使用的5.5.24版本,使用字符时依然...
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) ...
在这个时候,除了你可以优化索引及查询外,你还可以做什么?建立分区表(Table Partition)可以在某些场合下提高数据库的性能,在SQL Server 2005中也可以通过SQL语句来创建表分区,但在SQL Server 2008中提供了向导形式来创建分区表。本文介绍了如何来创建分区表。
To use multiple columns in range partitioning keys: CREATE TABLE simple_num ( a INT, b INT ) PARTITION BY RANGE COLUMNS(a, b) ( PARTITION p0 VALUES LESS THAN (5, 12), PARTITION p3 VALUES LESS THAN (MAXVALUE, MAXVALUE) ); 2. To create a list partitioned table: ...
])PARTITIONBYLIST(<column_name>);--创建分区子表语句CREATETABLE[ifnotexists] [<schema_name>.]<table_name>PARTITIONOF<parent_table>FORVALUESIN(<string_literal>); 参数说明。 创建分区表的参数说明如下。 支持将TEXT、VARCHAR以及INT类型的数据作为分区键(Partition Key),V1.3.22及以上版本支持将DATE类型...
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 ...
1171 - All parts of a PRIMARY KEY must be NOT NULL; if you need NULL in a key, use UNIQUE instead, Time: 0.003000s 原因: created_at作为分区列,需要是非空。 解决方案: 调整created_at为 Not null,同时设置default值 ALTER TABLE partition_test_new MODIFY COLUMN `created_at` timestamp NOT ...
bool Sql_cmd_alter_table_exchange_partition::exchange_partition(THD*thd, Table_ref*table_list, Alter_info*alter_info ) private Swap places between a partition and a table. Verify that the tables are compatible (same engine, definition etc), verify that all rows in the table will fit in th...