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sql - 计算每个目的地的乘客

问题描述

我正在尝试计算前往每个目的地的乘客人数。这是一些示例代码，如果有帮助的话。

DDL：

CREATE TABLE #PAX
(
  FLIGHT_NO INT,
  SEG INT,
  DEP VARCHAR(3),
  ARR VARCHAR(3),
  First_Class INT,
  Economy INT
)

DML：

INSERT INTO #PAX(FLIGHT_NO, SEG, DEP, ARR, First_Class, Economy)
SELECT 220, 1, 'STL', 'JFK', 11, 166
UNION ALL
SELECT 220, 2, 'STL', 'DXB', 13, 21
UNION ALL
SELECT 220, 3, 'JFK', 'DXB', 11, 150;

我想知道有多少乘客飞往 JFK 和 DXB。

预期结果：

SELECT 'STL', 'JFK', 24, 187
UNION ALL
SELECT 'JFK', 'DXB', 24, 171

到目前为止我的尝试：

WITH CTE1 AS
(
SELECT DEP, SUM(First_Class) AS First_Class, SUM(Economy) AS Economy FROM #PAX GROUP BY DEP HAVING COUNT(DEP) > 1 
),
LEG2 AS
(
SELECT ARR, SUM(First_Class) AS First_Class, SUM(Economy) AS Economy FROM #PAX GROUP BY ARR HAVING COUNT(ARR) > 1
)
SELECT #PAX.DEP, #PAX.ARR, CTE1.DEP, LEG2.ARR, 
SUM(CTE1.First_Class) AS First_Class, SUM(CTE1.Economy) AS Economy
,SUM(LEG2.First_Class) AS First_Class, SUM(LEG2.Economy) AS Economy
FROM #PAX LEFT OUTER JOIN CTE1 ON #PAX.DEP = CTE1.DEP
LEFT OUTER JOIN LEG2 ON #PAX.ARR = LEG2.ARR
GROUP BY #PAX.DEP, #PAX.ARR
, CTE1.DEP, LEG2.ARR

标签： sqlsql-serverazure-sql-databaseazure-sqldwazure-sql-data-warehouse

解决方案

根据您提供的数据，您可以使用 GROUP BY 查询根据 ARR 列进行分组：

SELECT ARR, SUM(First_Class) AS 'TOTAL_FIRST_CLASS', 
       SUM(Economy) AS 'TOTAL_ECONOMY', 
       SUM(First_Class) + SUM(Economy) AS 'TOTAL_PASSENGER'
FROM #PAX
GROUP BY ARR

根据评论修改答案：

SELECT DEP, '' AS ARR, SUM(First_Class) AS 'TOTAL_FIRST_CLASS', SUM(Economy) AS 'TOTAL_ECONOMY', SUM(First_Class) + SUM(Economy) AS 'TOTAL_PASSENGER'
FROM #PAX
WHERE DEP NOT IN (SELECT DISTINCT(ARR) FROM #PAX)
GROUP BY DEP
UNION ALL
SELECT '' AS DEP, ARR, SUM(First_Class) AS 'TOTAL_FIRST_CLASS', SUM(Economy) AS 'TOTAL_ECONOMY', SUM(First_Class) + SUM(Economy) AS 'TOTAL_PASSENGER'
FROM #PAX
WHERE ARR NOT IN (SELECT DISTINCT(DEP) FROM #PAX)
GROUP BY ARR

在提供规则以确定特定的 DEP 和 ARR 列值之前，无法根据提供的样本数据和预期结果确定相同的值。

更新的答案（基于提供的数据）：

SELECT CASE 
        WHEN DEPCOL = '' THEN (SELECT DISTINCT(ARR) FROM #PAX WHERE ARR != ARRCOL )
        ELSE DEPCOL
       END as 'CALC_DEP',

       CASE 
        WHEN ARRCOL = '' THEN (SELECT DISTINCT(DEP) FROM #PAX WHERE DEP != DEPCOL ) 
        ELSE ARRCOL
       END as 'CALC_ARR',


       TOTAL_FIRST_CLASS, 
       TOTAL_ECONOMY
FROM
(
SELECT DEP as DEPCOL, '' AS ARRCOL, SUM(First_Class) AS 'TOTAL_FIRST_CLASS', SUM(Economy) AS 'TOTAL_ECONOMY', SUM(First_Class) + SUM(Economy) AS 'TOTAL_PASSENGER'
FROM #PAX
WHERE DEP NOT IN (SELECT DISTINCT(ARR) FROM #PAX)
GROUP BY DEP
UNION ALL
SELECT '' AS DEPCOL, ARR AS ARRCOL, SUM(First_Class) AS 'TOTAL_FIRST_CLASS', SUM(Economy) AS 'TOTAL_ECONOMY', SUM(First_Class) + SUM(Economy) AS 'TOTAL_PASSENGER'
FROM #PAX
WHERE ARR NOT IN (SELECT DISTINCT(DEP) FROM #PAX)
GROUP BY ARR
) AS tflight

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