1

我正在尝试运行此代码：

`

with cart_amount as (select customer_id, count(customer_id) "Count" from in_cart group by customer_id)
with order_amount as (select customer_id, count(customer_id) "Count" from in_order group by customer_id)

select c.first_name "Customer Name",
       c.email "Customer Email"
from in_cart ic join customer c on ic.customer_id=c.customer_id
                join cart_amount ca on ic.customer_id=ca.customer_id
                join order_amount oa on ic.customer_id=oa.customer_id
where (ca."Count" - oa."Count") > 0 
group by c.first_name, c.email

`

但它给了我一个丢失的 SELECT 关键字错误，我不知道为什么。

4

3 回答 3

2

您不要with为多个 CTE 重复关键字。反而：

with cart_amount as (
      select customer_id, count(customer_id) "Count"
      from in_cart
      group by customer_id
     ),
     order_amount as (
      select customer_id, count(customer_id) "Count"
      from in_order
      group by customer_id
     )
select . . .
于 2020-12-11T22:25:48.613 回答
1

我看到它与嵌套的 cte 语法不匹配。

尝试这个

;WITH cart_amount
AS (
    SELECT customer_id,
        count(customer_id) "Count"
    FROM in_cart
    GROUP BY customer_id
    ),
order_amount
AS (
    SELECT customer_id,
        count(customer_id) "Count"
    FROM in_order
    GROUP BY customer_id
    )
SELECT c.first_name "Customer Name",
    c.email "Customer Email"
FROM in_cart ic
JOIN customer c ON ic.customer_id = c.customer_id
JOIN cart_amount ca ON ic.customer_id = ca.customer_id
JOIN order_amount oa ON ic.customer_id = oa.customer_id
WHERE (ca."Count" - oa."Count") > 0
GROUP BY c.first_name,
    c.email
于 2020-12-12T01:47:01.200 回答
0

您可以在没有CTE. 您可以having按如下方式使用子句：

select c.first_name "Customer Name",
       c.email "Customer Email"
  from in_cart ic join customer c on ic.customer_id=c.customer_id
  join in_cart ca on ic.customer_id=ca.customer_id
  join in_order oa on ic.customer_id=oa.customer_id
group by c.customer_id, c.first_name, c.email
Having count(distinct ca.pk_col) > count(distinct oa.pk_col)
于 2020-12-12T01:27:02.380 回答