如何使用右双内联视图

编程问答 2022-06-13

问题描述

在图中，我想知道分别具有Coastal ='Y'和Coastal ='N'的州的数量，并且当我分别使用子查询时，可以获得正确的结果。但是，当我输入两个查询时，它们突然多个“ Y”和“ N”。我不知道他们为什么给我奇怪的结果。

%%sql
Select  count(numcoastal)
From (Select state,count(*) as numcoastal
     From Regions Where coastal ='Y' Group by state)C
    
count(numcoastal)
19

%%sql
Select count(numnot)
From (Select state,count(*) as numnot
     From Regions Where coastal ='N' Group by state)NC

count(numnot)
24

%%sql
Select  count(numcoastal),count(numnot)
From (Select state,count(*) as numcoastal
     From Regions Where coastal ='Y' Group by state)C,(Select state,count(*) as numnot
     From Regions Where coastal ='N' Group by state)NC
    
count(numcoastal)   count(numnot)
    456                    456

解决方法

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