SQL 给出百分比

Question

我已经用法语提出了这个请求。我不确定您是否需要数据库 DB。我正在使用 ORACLE

我只想将 avg(Taux_remplissage) 或 MOY x 100 相乘，因为我想要它作为百分比。我应该怎么做？

SELECT numC , sum(prix) as Cout_Tot , avg(Taux_remplissage) as MOY
FROM
(
SELECT P.numC , P.dateDep , C.prix  ,nbRes , nbPlaces , ( R.nbRes / 
P.nbPlaces) as Taux_remplissage
FROM lesProgrammations P
JOIN lesReservations R ON R.numC = P.numC AND R.dateDep = P.dateDep  
JOIN lesCircuits C ON P.numC = C.numC
ORDER BY P.numC , P.dateDep
)
GROUP BY numC
ORDER BY numC;

编辑：感谢您的帮助！我找到了解决方案:)

avg(Taux_remplissage) * 100 / sum(Taux_remplissage) AS Taux_moy_remplissage

Answer 1

像下面那样尝试乘 avg(Taux_remplissage)*100

SELECT numC , sum(prix) as Cout_Tot , avg(Taux_remplissage)*100 as MOY
FROM
(
SELECT P.numC , P.dateDep , C.prix  ,nbRes , nbPlaces , ( R.nbRes / 
P.nbPlaces) as Taux_remplissage
FROM lesProgrammations P
JOIN lesReservations R ON R.numC = P.numC AND R.dateDep = P.dateDep  
JOIN lesCircuits C ON P.numC = C.numC
ORDER BY P.numC , P.dateDep
)
GROUP BY numC
ORDER BY numC;

Answer 2

您不需要子查询：

SELECT numC, sum(prix) as Cout_Tot,
       (100 * avg(R.nbRes / P.nbPlaces)) as MOY
FROM lesProgrammations P JOIN
     lesReservations R
     ON R.numC = P.numC AND R.dateDep = P.dateDep JOIN 
     lesCircuits C
     ON P.numC = C.numC
GROUP BY numC
ORDER BY numC;

此外，ORDER BY不适合子查询。

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