Oracle 有子句中的任务问题

Question

在Having 子句中，我试图比较2 列，因为条件是CUST_CREDIT_LIMIT 需要乘以500 并与sum(s.amount_sold) 进行比较。 任何想法如何处理这个问题。 在此处输入图像描述

Answer 1

就像你说的（看起来你在having子句中缺少sum聚合 function ）（另外，你应该将所有非聚合列放入group by子句；你的包含s.amount_sold ，而它不应该）：

group by c.cust_first_name, 
         c.cust_last_name,
         substr(c.cust_income_level, -7, 8),
         case when c.cust_credit_limit <= 1500 then 'Low limit'
              when c.cust_credit_limit >  1500 then 'High limit'
         end,
         c.cust_valid
having sum(s.amount_sold) > c.cust_credit_limit * 500 

Answer 2

看起来您想将聚合放入仅包含SALES表的子查询中，然后将结果JOIN CUSTOMERS表，并可以将信用额度与连接条件中的销售额进行比较（并删除GROUP BY和来自外部查询的HAVING子句）：

SELECT c.cust_first_name || ' ' || c.cust_last_name AS customer_name,
       TO_NUMBER(SUBSTR(c.cust_income_level, -7), '9999999') AS upper_income_level,
       s.total_amount,
       CASE
       WHEN c.cust_credit_limit <= 1500
       THEN 'Low Limit'
       WHEN c.cust_credit_limit >  1500
       THEN 'High Limit'
       END AS credit_limit_level,
       c.cust_valid
FROM   sh.customers c
       INNER JOIN (
         SELECT cust_id,
                SUM(amount_sold) AS total_amount
         FROM   sh.sales
         GROUP BY cust_id
       ) s
       ON (   c.cust_id = s.cust_id
          AND s.total_amount > c.cust_credit_limit * 500 )
WHERE  c.cust_valid = 'A'
AND    c.cust_income_level LIKE '%-%'            -- Check for a hyphen anywhere
-- AND SUBSTR(c.cust_income_level, -8, 1) = '-'  -- Check for a hyphen in a specific place