commit;3、查询表中全量数据，select t.*, rowid from test_max t;4、编写sql，使用rank分析函数，取value值为最大的记录; select t.* from (select t.*, rank() over(order by value desc) rk from test_max t) t where rk = 1;实现例句如下：SELECT a.FRO
sql_hash_value = c.hash_value AND a.username IS NOT NULL; #查看总耗时前10的sql select * from (select v.sql_id, v.child_number, v.sql_text, v.elapsed_time, v.cpu_time, v.disk_reads, rank() over(order by v.elapsed_time desc) elapsed_rank from v$sql v) a where elapsed_rank...
first_value() over(partition by … order by …):求分组后的第一个。 last_value() over(partition by … order by …):求分组后的最后一个。 count() over(partition by … order by …):求分组后的总数。 max() over(partition by … order by …):求分组后的最大值。 min() over(partition ...
rank() over() SQL> select stuid,name,score,rank() over(order by score desc) as rank from tblscore; STUID NAME SCORE RANK --- --- --- --- 1003 tom 90 1 1005 tonny 90 1 1004 jeson 80 3 1002 jack 80 3 1001 alex 70 5 1006 hans 50 6 6 rows selected 2.count() over():计...
dense_rank() over (order by sum(s.amount_sold) desc nulls last) as dense_rank from all_sales s where s.year=1998 and s.amount_sold is not null group by s.prod_id order by s.prod_id; 与PARTITION BY 子句结合使用 select s.prod_id, s.month_id, sum(s.amount_sold), ...
MAX(salary) KEEP(DENSE_RANK LAST ORDER BY commission_pct) OVER(PARTITION BY department_id) "Best" FROM employees WHERE department_id in (20, 80) ORDER BY department_id, salary; LAST_VALUE 功能描述:返回组中数据窗口的最后一个值。 下面例子计算按部门分区按薪水排序的数据窗口的最后一个值对应的...
聚合函数RANK 和 dense_rank 主要的功能是计算一组数值中的排序值。 在9i版本之前,只有分析功能(analytic ),即从一个查询结果中计算每一行的排序值,是基于order_by_clause子句中的value_exprs指定字段的。 其语法为: RANK ( ) OVER ( [query_partition_clause] order_by_clause ) ...
from v$session_longops , v$sql where time_remaining <> 0 and sql_address = address and sql_hash_value = hash_value /11。查看数据表的参数信息SELECT partition_name, high_value, high_value_length, tablespace_name,pct_free, pct_used, ini_trans, max_trans, initial_extent,next_extent, min_...
select emp.*,DENSE_RANK() over (partition by deptno order by sal desc) rownumber from emp) emp2 where rownumber=1 结果如下: 10 5000.00 7839 20 3000.00 7788 20 3000.00 7902 30 2850.00 7698 [Oracle]高效的SQL语句之分析函数(三)--row_number() /rank()/dense_rank() ...
OVER、RANK、LEAD、LOGMIN、MAXUNION、MINUS、INTERSECTHAVING 觸發程序 SSMA 會根據下列規則建立觸發程序:BEFORE 觸發程序轉換成 INSTEAD OF 觸發程序。AFTER 觸發程序轉換成 AFTER 觸發程序。INSTEAD OF 觸發程序轉換成 INSTEAD OF 觸發程序。 在相同作業上定義的多個 INSTEAD OF 觸發程序會合併成一個觸發...