sum(id) over(order by id rows between unbounded preceding and current row) as rows_sum, sum(id) over(order by id range between unbounded preceding and current row) as range_sum, sum(id) over(order by id rows between 1 preceding and 2 following) as rows_sum_1, sum(id) over(order ...
--注意ROWS BETWEEN 1 preceding AND 1 following 是指当前行的上一行(rownum-1)到当前行的下两行(rownum+2)的汇总 SELECT EMPNO, ENAME, DEPTNO, SAL, SUM(SAL) OVER(PARTITION BY DEPTNO ORDER BY ENAME ROWS BETWEEN 1 PRECEDING AND 2 FOLLOWING) max_sal FROM EMP; EMPNO ENAME DEPTNO SAL MAX_SAL ...
value PRECEDING:窗口从当前行向前value行开始 value FOLLOWING:窗口从当前行向后value行结束 示例: selectname,date,timestamp,number,-- 前1行_当前行sum(number)over(partitionbynameorderbytimestamprowsbetween1precedingandcurrentrow)assum_number_w1_row,-- 前1行_后1行sum(number)over(partitionbynameorderby...
UNBOUNDED PRECEDING 表示该窗口最前面的行(起点) UNBOUNDED FOLLOWING:表示该窗口最后面的行(终点) 比如说: ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW(表示从起点到当前行) ROWS BETWEEN 2 PRECEDING AND 1 FOLLOWING(表示往前2行到往后1行) ROWS BETWEEN 2 PRECEDING AND 1 CURRENT ROW(表示往前2行到当前...
--注意ROWS BETWEEN 1 preceding AND 1 following 是指当前行的上一行(rownum-1)到当前行的下两行(rownum+2)的汇总 SELECT EMPNO, ENAME, DEPTNO, SAL, SUM(SAL) OVER(PARTITION BY DEPTNO ORDER BY ENAME ROWS BETWEEN 1 PRECEDING AND 2 FOLLOWING) max_sal ...
1. ROWS BETWEEN在SQL Server中的用途 在SQL Server中,ROWS BETWEEN子句用于定义窗口函数(如ROW_NUMBER(), RANK(), DENSE_RANK(), SUM(), AVG()等)中数据行的范围。它指定了窗口函数应该考虑哪些行来计算其值。ROWS BETWEEN子句可以指定在当前行之前、之后或两者之间的行数。 2. 1 PRECEDING和0 FOLLOWING在...
rows/rang between ... preceding and ... following 分析函数的语法结构一般是:分析函数名(参数) OVER (PARTITION BY子句 ORDER BY子句 ROWS/RANGE子句) 即由以下三部分组成: 分析函数名:如sum、max、min、count、avg等聚集函数以及lead、lag行比较函数等; ...
rows between 2 preceding and 1 current row: 表示往前2行到当前行 rows between current row and unbounded following: 表示当前行到终点 【测试过程】 1.测试数据说明 由于本人之前从事过计量行业,因此模拟物联网采集设备采集读数作为本次测试数据,用前一天数据与后一天数据计算得到本期用量,具体数据如下: ...
●ROWS BETWEEN 1 PRECEDING AND 1 FOLLOWING :指当前行的上一行(ROWNUM-1)到当前行的下一行(ROWNUM+1)的数据 ●RANGE BETWEEN CURRENT ROW AND 350 FOLLOWING:指当前行到当前行数据+350的范围内的数据 ●RANGE BETWEEN 5 PRECEDING AND 5 FOLLOWING:指当前行数据幅度减5加5后的范围内的数据 2.ROWS和RANGE的...
Oracle为这种情况提供了一个子句:rows between ... preceding and ... following。从字面上猜测它的意思是:在XXX之前和XXX之后的所有记录,实际情况如何让我们通过示例来验证: SQL> select month, 2 sum(tot_sales) month_sales, 3 sum(sum(tot_sales)) over (order by month ...