1CREATETABLElist_example(2dnameVARCHAR2(10),3DATAVARCHAR2(20)4) PARTITIONBYLIST(dname)5(6PARTITION part01VALUES('ME','PE','QC','RD'),7PARTITION part02VALUES('SMT','SALE')8); 3、哈希分区表 1CREATETABLEhash_example(2hash_key_column DATE,3DATAVARCHAR2(20)4) PARTITIONBYHASH(hash_key_...
create table range_list_example ( id number(2), done_date date, data varchar2(50) ) --顶层范围分区的分区键为 range_list_example 表中的 done_date 字段; --第二层列表分区的分区键为 range_list_example 表中的 id 字段; partition by range (done_date) subpartition by list (id) ( partitio...
ALTER TABLE SALES RENAME PARTITION P21 TO P2;2。。 1. 三、删除分区 You can drop partitions from range, list, or composite range-list partitioned tables. ALTER TABLE ... DROP PARTITION part_name; For hash-partitioned tables, or hash subpartitions of range-hash partitioned tables, you must...
oracle create table partition by 表达式在Oracle数据库中,分区表是一种将表物理上分割成多个独立的部分的技术。每个分区可以独立于其他分区进行存储、备份和索引,从而提高了查询性能、数据管理和维护的便利性。 创建分区表时,您可以使用表达式来确定分区键,这个表达式基于表中的一列或多列。例如,您可能想要根据日期对...
)PARTITION BY LIST(dname) ( PARTITION part01 VALUES('ME','PE','QC','RD'), PARTITION part02 VALUES('SMT','SALE') ); 3、哈希分区表 CREATE TABLE hash_example( hash_key_column DATE, DATA VARCHAR2(20) ) PARTITION BY HASH(hash_key_cloumn) ...
范围分区表是通过 create table 语句的 partition by range 子句来创建的,分区的范围通过 values less than 子句指定,其指定的是分区的上限(不包含),所有大于等于指定值的数据被分配至下一个分区,除了第一个分区,每个分区的下限即前一个分区的上限: create table members ( ...
CREATE TABLE list_example (dname VARCHAR2 (10), DATA VARCHAR2 (20)) PARTITION BY LIST (dname) (PARTITION part01 VALUES ('ME', 'PE', 'QC', 'RD'), PARTITION part02 VALUES ('SMT', 'SALE')); 1. 2. 3. 4. 5. 6. (3)、哈希分区表 ...
CREATE TABLE table_name ( ... ) PARTITION BY RANGE(column1) INTERVAL expr [STORE IN (tablespace1,[tablespace2,...])] ( PARTITION partition_name1 VALUES LESS THAN(literal | MAXVALUE) [TABLESPACE tablespace1], PARTITION partition_name2 VALUES LESS THAN(literal | MAXVALUE) [TABLESPACE tablesp...
ORDER BY on OVER needed the PARTITION BY to have a non-unique combination, otherwise all row_numbers will become 1 An example, this is your data: create table tbl(hi varchar, ho varchar); insert into tbl values ('A','X'), ('A','Y'), ('A','Z'), ('B','W'), ('B','W...
CREATETABLEpublic.time_stuff(col1int,col2textdefault'stuff',col3 timestamptzNOTNULLDEFAULTnow())PARTITIONBYRANGE(col3);SELECTpartman.create_parent('public.time_stuff','col3','1 day'); 1. 2. 3. 4. 5. 6. 7. 复制 \d+time_stuff ...