select deptno,dense_rank() over(partition by deptno order by sal) from emp order by deptno; 4. select deptno,ename,sal,lag(ename,1,null) over(partition by deptno order by ename) from emp ord er by deptno; 5. select deptno,ename,sal,lag(ename,2,'example') over(partition by deptno o...
COUNT(*) over (PARTITIONBYdeptnoORDERBYempno)ASsum_dept_add,--- 查询出的部门人员数依次为前一行的求和数加上当前行的行数(若未sum则会是逐行累加的数据) COUNT(*) over(PARTITIONBYjob) cnt_job_man ,---查询岗位的的人员数量 (等同于用岗位job进行分组查询) COUNT(*) over (PARTITIONBYjobORDERBYemp...
select deptno,dense_rank() over(partition by deptno order by sal) from emp order by deptno; 4. select deptno,ename,sal,lag(ename,1,null) over(partition by deptno order by ename) from emp ord er by deptno; 5. select deptno,ename,sal,lag(ename,2,'example') over(partition by deptno o...
· Tables containing historical data, in which new data is added into the newest partition. A typical example is a historical table where only the current month's data is updatable and the other 11 months are read only. Oracle分区表的优缺点: 优点: (1)提高可用性。 (2)去除数据库中的大段...
Here is the example: PARENT TABLE CREATE TABLE parent_tab ( id NUMBER NOT NULL, code VARCHAR2(10) NOT NULL, description VARCHAR2(50), created_date TIMESTAMP(6), CONSTRAINT parent_tab_pk PRIMARY KEY (id) ) PARTITION BY RANGE (created_date) SUBPARTITION BY LIST (descri...
)--创建散列分区,分区键为示例表(hash_example)中的 done_date 字段partitionbyhash (done_date) ( partition part_1, partition part_2 ); select*fromuser_tab_partitionswheretable_name='HASH_EXAMPLE'; 1. 2. 3. 4. 5. 6. 7. 8.
RAW if the measure column is RAW; otherwise the return value is VARCHAR2. Aggregate Examples The following single-set aggregate example lists all of the employees in Department 30 in the hr.employees table, ordered by hire date and last name: SELECT LISTAGG(last_name, ‘; ‘) WITHIN GROUP...
Using Oracle NTILE() function with PARTITION BY clause example The following statement divides into 4 buckets the values in thesalescolumn of thesalesman_performanceview in the year of 2016 and 2017: SELECTsalesman_id, sales,year, NTILE(4)OVER(PARTITIONBYyearORDERBYsalesDESC) quartileFROMsalesman_...
ALTER TABLE orders TRUNCATE PARTITION P2009; Ø 截断子分区: ALTER TABLE orders TRUNCATE SUBPARTITION SYS_SUBP70; 注:hash分区和hash子分区可以truncate。 分区表的管理:分区移动(MOVE) alter table emp_part move partition p2 tablespace example;
Purpose is to create html table with "colspan" base on result given by the count column Example OUTPUT ---DATE|06-MAR-23(COLSPAN=3)|07-MAR-23COLSPAN=1|08-MAR-23COLSPAN=3---AAA|361-1|361-2|361-3