Sql 如何从第二列运行总计
我有一个如下的数据集Sql 如何从第二列运行总计,sql,oracle,lag,window-functions,analytic-functions,Sql,Oracle,Lag,Window Functions,Analytic Functions,我有一个如下的数据集 Lot Size Reported QTY Qty Balance 150 100 150 100 150 80 150 80 150 5 数量余额需要按如下方式计算: Row 1 = Lot Size - Reported Qty (row1)
Lot Size Reported QTY Qty Balance
150 100
150 100
150 80
150 80
150 5
数量余额需要按如下方式计算:
Row 1 = Lot Size - Reported Qty (row1) => 150-100 = 50
Row 2 = Reported Qty (row1) - Reported Qty(row2) => 100-100 =0
Row 3 = Reported Qty (row2) - Reported Qty(row3) => 100-80 =20
... till the last row
我的预期结果是
Lot Size Reported QTY Qty Balance
150 100 50
150 100 0
150 80 20
150 80 0
150 5 75
如何在查询中实现这一点?您应该看看
LAG()
分析函数。有关函数及其接受的参数的详细信息,请参阅(例如,我认为当lag()函数返回null时,需要传入lot_size列的默认值)
一旦确定了前一行的报告数量值,就可以简单地减去它。当然,您需要某种方法来确定行的顺序—您的示例数据似乎没有,因此数据库将无法确定哪一行是第一行,哪一行是最后一行
例如
正如@Boneist所建议的,您需要使用LAG()OVER()分析函数 您只需再执行一个任务来处理将为空的第一行,使用CASE就可以使它工作 测试用例
SQL> WITH data AS
2 ( SELECT t.*, lag(reported_qty) OVER(ORDER BY NULL) rn FROM t
3 )
4 SELECT lot_size,
5 reported_qty,
6 CASE
7 WHEN rn IS NULL
8 THEN lot_size - reported_qty
9 ELSE rn - reported_qty
10 END qty_balance
11 FROM data;
LOT_SIZE REPORTED_QTY QTY_BALANCE
---------- ------------ -----------
150 100 50
150 100 0
150 80 20
150 80 0
150 5 75
SQL>
Oracle 11g R2架构设置:
CREATE TABLE lots ( Lot_Size, Reported_QTY ) AS
SELECT 150, 100 FROM DUAL
UNION ALL SELECT 150, 100 FROM DUAL
UNION ALL SELECT 150, 80 FROM DUAL
UNION ALL SELECT 150, 80 FROM DUAL
UNION ALL SELECT 150, 5 FROM DUAL;
SELECT Lot_Size,
Reported_QTY,
COALESCE( LAG( Reported_QTY ) OVER ( ORDER BY NULL ) - Reported_QTY,
Lot_Size - Reported_QTY ) AS Qty_Balance
FROM Lots
| LOT_SIZE | REPORTED_QTY | QTY_BALANCE |
|----------|--------------|-------------|
| 150 | 100 | 50 |
| 150 | 100 | 0 |
| 150 | 80 | 20 |
| 150 | 80 | 0 |
| 150 | 5 | 75 |
查询1:
CREATE TABLE lots ( Lot_Size, Reported_QTY ) AS
SELECT 150, 100 FROM DUAL
UNION ALL SELECT 150, 100 FROM DUAL
UNION ALL SELECT 150, 80 FROM DUAL
UNION ALL SELECT 150, 80 FROM DUAL
UNION ALL SELECT 150, 5 FROM DUAL;
SELECT Lot_Size,
Reported_QTY,
COALESCE( LAG( Reported_QTY ) OVER ( ORDER BY NULL ) - Reported_QTY,
Lot_Size - Reported_QTY ) AS Qty_Balance
FROM Lots
| LOT_SIZE | REPORTED_QTY | QTY_BALANCE |
|----------|--------------|-------------|
| 150 | 100 | 50 |
| 150 | 100 | 0 |
| 150 | 80 | 20 |
| 150 | 80 | 0 |
| 150 | 5 | 75 |
:
CREATE TABLE lots ( Lot_Size, Reported_QTY ) AS
SELECT 150, 100 FROM DUAL
UNION ALL SELECT 150, 100 FROM DUAL
UNION ALL SELECT 150, 80 FROM DUAL
UNION ALL SELECT 150, 80 FROM DUAL
UNION ALL SELECT 150, 5 FROM DUAL;
SELECT Lot_Size,
Reported_QTY,
COALESCE( LAG( Reported_QTY ) OVER ( ORDER BY NULL ) - Reported_QTY,
Lot_Size - Reported_QTY ) AS Qty_Balance
FROM Lots
| LOT_SIZE | REPORTED_QTY | QTY_BALANCE |
|----------|--------------|-------------|
| 150 | 100 | 50 |
| 150 | 100 | 0 |
| 150 | 80 | 20 |
| 150 | 80 | 0 |
| 150 | 5 | 75 |
所有伟大的答案。。谢谢大家!!我只是选择了最适合我的答案作为最佳答案。你不需要案例陈述——你可以完全在滞后函数中完成。我用一个例子更新了我的答案。@Boneist是的,很微妙<代码>偏移量和
默认值
是键。说得好,谢谢。@Boneis很抱歉拼错了你的名字。。。顺便说一下,有一天我们见面的时候,我们可以一起创作一些好音乐。我将向你展示我的吉他和歌唱技巧:-)没关系;我见过各种各样的变奏*{;-)不过,我不太确定吉他和长号是否能很好地混合!你不需要合并-你可以完全在滞后函数内完成。我用一个例子更新了我的答案。