Question

尝试在新创建的计算列上使用sum（）。求和函数无法识别calc列名称。这是我的代码

select name, is_open,    
       CASE WHEN text like '%perfect%' or '%amazing%' or '%happy%' or '%delicious%'or '%fabulous%'or '%fantastic%'or '%kind%'   THEN 1
            WHEN text like '%hate%'or '%horrible%'or '%bad%'or '%angry%'or '%fantastic%'or '%expensive%'or '%disgusting%' THEN -1
       END sentiment_rating,    
       sum(sentiment_rating) as sum
from review as r left join
     business as b
     on b.id = r.business_id
where is_open is not Null and sentiment_rating is not Null
group by name
order by name ASC

Answer 1

同时选择未聚合的列和聚合的列都没有意义。因此，只需xyz/表达式：

sum()

我不确定是要每select name, is_open, sum(CASE WHEN text like '%perfect%' or text like '%amazing%' or text like '%happy%' or text like '%delicious%' or text like '%fabulous%' or text like '%fantastic%' or text like '%kind%' THEN 1 WHEN text like '%hate%' or text like '%horrible%' or text like '%bad%' or text like '%angry%' or text like '%fantastic%'or '%expensive%' or text like '%disgusting%' THEN -1 END) as sum_sentiment_rating from review as r left join business as b on b.id = r.business_id where is_open is not Null and sentiment_rating is not Null group by name, is_open order by name ASC;行还是每name / name行。我假设是后者，并将is_open添加到is_open。

Answer 2

您所有的LIKE条件在语法上都是错误的。
您不能拥有：

text like '%perfect%' or '%amazing%'....

正确的语法是：

text like '%perfect%' or text like '%amazing%' ....

然后，您必须直接对计算得出的CASE列求和，并在分组列中包含is_open：

select name, is_open,    
  SUM(CASE 
    WHEN text like '%perfect%' or text like '%amazing%' or text like '%happy%' or text like '%delicious%' or text like '%fabulous%' or text like '%fantastic%' or text like '%kind%' THEN 1
    WHEN text like '%hate%' or text like '%horrible%' or text like '%bad%' or text like '%angry%' or text like '%fantastic%' or text like '%expensive%' or text like '%disgusting%' THEN -1
  END) as sumrating
from review as r left join
     business as b
     on b.id = r.business_id
where is_open is not Null and sentiment_rating is not Null
group by name, is_open
order by name ASC

在计算列上使用聚合函数

2 个答案: