“RANGE|ROWS BETWEEN 边界规则1 AND 边界规则2”部分用来定位聚合计算范围,这个子句又被称为定位框架。 例子程序一:查询从第一行到当前行的工资总和: View Code 这里的开窗函数“SUM(FSalary)OVER(ORDERBYFSalary ROWSBETWEENUNBOUNDED PRECEDINGANDCURRENTROW)”表示按照FSalary进行排序,然后计算从第 一行(UNBOUNDED ...
4sum(U_Id)over(orderbyU_Id rowsBETWEENunbounded precedingANDCURRENTROW) 列3,5sum(U_Id)over(orderbyU_Id rowsBETWEEN1precedingAND2following) 列4,6sum(U_Id)over(orderbyU_Id ROWSBETWEEN1PRECEDINGANDCURRENTROW) 列57fromUserInfo
FIRST_VALUE(val) OVER w AS 'first', LAST_VALUE(val) OVER w AS 'last', NTH_VALUE(val, 2) OVER w AS 'second', NTH_VALUE(val, 4) OVER w AS 'fourth' FROM observations WINDOW w AS (PARTITION BY subject ORDER BY time ROWS UNBOUNDED PRECEDING); +---+---+---+---+---+---+...
ROWS或RANGE要求指定ORDER BY子句。 如果ORDER BY包含多个顺序表达式,CURRENT ROW FOR RANGE则确定当前行时,请考虑列表中的所有列ORDER BY。 UNBOUNDED PRECEDING 适用于:SQL Server 2012 (11.x) 及更高版本。 指定窗口在分区中的...
avg(temperature) over(order by recordDate rows between unbounded preceding and current row) as '第一条记录到今天的天气均值' from weather; 1. 2. 3. 4. 5. 6. 7. 聚合函数 Sales表 -- 这里举例了几个常见的聚合函数 select *, max(sales) over(partition by month(idate)) as max, ...
ROWS或RANGE會要求您指定ORDER BY子句。 如果ORDER BY包含多個順序表示式,CURRENT ROW FOR RANGE則決定目前數據列時,會考慮清單中的所有數據ORDER BY行。 UNBOUNDED PRECEDING 適用於:SQL Server 2012 (11.x) 和更新版本。 指定視窗從資料分割的第一個資料列開始。UNBOUNDED PRECEDING只能指定為視窗起點。
ROWS与RANGE之间的区别 当你用OVER()子句进行你的分析计算来打开你的窗口,你也可以在窗口里看到的,通过ROWS与RANGE选项来限制你的行数。来看下面的T-SQL语句: 1SELECT2t.OrderYear,3t.OrderMonth,4t.TotalDue,5SUM(t.TotalDue)OVER(ORDERBYt.OrderYear, t.OrderMonth ROWSBETWEENUNBOUNDED PRECEDINGANDCURRENTROW...
-＞ SELECT yearweek(payment_date) payment_week, -＞ sum(amount) week_total, -＞ sum(sum(amount)) -＞ over (order by yearweek(payment_date) -＞ rows unbounded preceding) rolling_sum -＞ FROM payment -＞ GROUP BY yearweek(payment_date) -＞ ORDER BY 1;...
``` SELECT SUM(Amount) OVER (ORDER BY Date DESC ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW) FROM TableName; ``` 此查询将返回 TableName 表中每行日期(Date)的滚动总和。该查询使用 OVER 子句和 ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW 窗口定义来计算滚动总和。©...