FIRST_VALUE 返回组中数据窗口的第一个值 FIRST_VALUE ( [scalar_expression )OVER ( [ partition_by_clause ] order_by_clause ) LAST_VALUE 返回组中数据窗口的最后一个值 LAST_VALUE ( [scalar_expression )OVER ( [ partition_by_clause ]
first_value和last_value 是用来去分析函数窗口中对应列的第一个值和最后一个值的函数。 语法如下: first_value(col[ignore NULLS])over([PARTITION BY col][ORDER BY sal][windows]) last_value(col[ignore NULLS])over([PARTITION BY col][ORDER BY sal][windows])--col : 表示选取的列--ignore NULLS ...
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 ...
4、first_value() over()和last_value() over()的使用 1 select ,t.class,t.sroce,first_value(t.sroce) over(partition by t.class order by t.sroce desc) mm from T2_TEMP t; 2 select ,t.class,t.sroce,last_value(t.sroce) over(partition by t.class order by t.sroce desc) mm fr...
GROUP BY B.CDDPTY, B.CDCURR ) C ON A.CDDPTY = C.CDDPTY AND A.CDCURR = C.CDCURR AND A.CDVLDT = C.CDVLDT 方法2: 用分析函数 SELECT DISTINCT T.CDDPTY,T.CDCURR, FIRST_VALUE(T.CDYRAT) OVER(PARTITION BY T.CDCURR,T.CDDPTY ORDER BY T.CDVLDT DESC) CDYRAT ...
first_name||' '||last_name employee_name, hire_date, salary, FIRST_VALUE(first_name||' '||last_name) OVER (PARTITION BY department_id ORDER BY salary ASC ) AS lowest_sal, LAST_VALUE(first_name||' '||last_name) OVER(PARTITION BY department_id ORDER BY salary) AS highest_sal ...
first_value(sal) over(partition by deptno) first_sal, last_value(sal) over(partition by deptno) last_sal, sum(sal) over(partition by deptno) 部门总工资, avg(sal) over(partition by deptno) 部门平均工资, count(1) over(partition by deptno) 部门总数, ...
FIRST_VALUE (expression) [ {RESPECT | IGNORE} NULLS ]) OVER ( [ query_partition_clause ] order_by_clause [frame_clause] )Code language:SQL (Structured Query Language)(sql) In this syntax: expression is an expression evaluated against the value of the first row in the window frame specifie...
area,dense_rank() over(partition by year, month order by income desc) rank from (select t.year, t.month, t.area, sum(income) income from test_ta t group by t.year, t.month, t.area))where rank = 1 -- 最内层子查询：统计每个月份，每个大区的总收入 -- 第二层子查询：...
oracle开窗函数有很多,用的比较多的是over(…),使用的话一般是和order、partition by、row_number()、rank()、dense_rank()几个函数一起使用 例子:成绩表的例子, 数据表为t_score,字段分别为stuId,stuName,classId ,score 代码语言:javascript 代码运行次数:0 ...