在Oracle数据库中,可以使用TRUNCATE TABLE ... PARTITION语句来清空特定分区的数据,而不会删除分区本身或影响其他分区的数据。 TRUNCATE TABLE PARTITION 的基本用法 TRUNCATE TABLE ... PARTITION语句的语法如下: sql TRUNCATE TABLE table_name PARTITION partition_name; 或者,如果你想在清空分区数据的同时更新全局索...
去重重复数据:多个字段,只留有rowid最小的记录 。 delete from cs a where (a.xm,a.zjh,a.dz) in (select xm,zjh,dz from cs group by xm,zjh,dz having count(*)>1) and rowid not in (select min(rowid) from cs group by xm,zjh,dz having count(*)>1) ③row_number()over(partition by...
CREATE TABLE CUSTOMER ( CUSTOMER_ID NUMBER NOT NULL PRIMARY KEY, FIRST_NAME VARCHAR2(30) NOT NULL, LAST_NAME VARCHAR2(30) NOT NULL, PHONEVARCHAR2(15) NOT NULL, EMAILVARCHAR2(80), STATUS CHAR(1) ) PARTITION BY RANGE (CUSTOMER_ID) ( PARTITION CUS_PART1 VALUES LESS THAN (100000) TABLE...
select index_name, table_name, table_type, partitioned from user_indexes where table_name = 'RANGE_PART_TAB'; ---查看分区索引类型等 select index_name, table_name, partitioning_type, locality, alignment from user_part_indexes where table_name = 'RANGE_PART_TAB'; ---本地索引,分区个数和...
TRUNCATE PARTITION statement to remove all rows from a table partition. The ALTER TABLE ... TRUNCATE PARTITIONS statement does this for multiple partitions. 使用ALTER TABLE ... TRUNCATE PARTITION 语句从表分区中删除所有行。ALTER TABLE ... TRUNCATE PARTITIONS语句对多个分区执行此操作。 Truncating a ...
create table r --创建基于值范围的分区,分区子句未指定表空间时则位于缺省的表空间 (a int) partition by range (a) ( partition p1 values less than (10), partition p2 values less than (20), partition p3 values less than (30), partition p4 values less than (maxvalue) ...
PARTITION CUS_PART2 VALUES LESS THAN (200000) TABLESPACE CUS_TS02 ) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 例二:按时间划分 CREATE TABLE ORDER_ACTIVITIES ( ORDER_ID NUMBER(7) NOT NULL, ORDER_DATE DATE, TOTAL_AMOUNT NUMBER, ...
6:exclusive 独占(X):独立访问使用,exclusive6级锁有:Drop table, Drop Index, Alter table,Truncate table, Lock Exclusive。珠宝店类比 珠宝店可以给大家免费参观,可以让你预定,可以试用后觉得好再买,可以把店都买下来。 第0类人,免费参观珠宝店的人;...
2. TRUNCATE PARTITION ... CASCADE 通过TRUNCATE PARTITION ... CASCADE命令,我们可以清空父表分区和子表分区。 ALTER TABLE t1 TRUNCATE PARTITION part_2014CASCADE UPDATE INDEXES; EXEC DBMS_STATS.gather_table_stats(USER,'t1'); EXEC DBMS_STATS.gather_table_stats(USER, 't2'); ...
CREATE TABLE 表名 ( 列名 数据类型(宽度,精度) 是否为空 约束/属性, ... ) PARTITION BY RANGE(分区字段列1,分区字段列2,...) ( PARTITION 分区名 LESS THAN (值1,值2,...) TABLESPACE 表空间名称, ... ); --案例 CREATE TABLE ord_mast_new ( orderno...