Question

我有几个返回SYS_REFCURSOR的程序。一个叫cust_cursor，另一个叫prod_cursor。后者存储产品的ID和数量。到目前为止，我能够打印每个单独的数量，如下面的匿名块所示。

DECLARE
    cust_cursor   SYS_REFCURSOR;
    cust_id       ex1.address_detail.id_customer%TYPE;
    addr_id       ex1.address_detail.id_address%TYPE;
    prod_cursor   SYS_REFCURSOR;
    prod_id       ex1.SALES_ORDER_DETAIL.ID_PROD%TYPE;
    prod_qty      ex1.SALES_ORDER_DETAIL.ORDER_QTY%TYPE;
BEGIN
    ex1.INFO_SALES.TOP_CUSTOMERS (cust_cursor);

    LOOP
        FETCH cust_cursor INTO cust_id, addr_id;

        EXIT WHEN cust_cursor%NOTFOUND;
        ex1.info_sales.top_products (addr_id, prod_cursor);
        DBMS_OUTPUT.put_line (
            'Customer' || CHR (9) || '|' || CHR (9) || 'Address');
        DBMS_OUTPUT.put_line (
            cust_id || CHR (9) || CHR (9) || '|' || CHR (9) || addr_id);
        DBMS_OUTPUT.put_line (
            'Product' || CHR (9) || '|' || CHR (9) || 'Quantity');

        LOOP
            FETCH prod_cursor INTO prod_id, prod_qty;

            EXIT WHEN prod_cursor%NOTFOUND;
            DBMS_OUTPUT.put_line (
                prod_id || CHR (9) || CHR (9) || '|' || CHR (9) || prod_qty);
        END LOOP;

        CLOSE prod_cursor;

        DBMS_OUTPUT.put_line (
            '------------------------------------------------------------');
    END LOOP;

    CLOSE cust_cursor;
END;

如何在prod_cursor中计算每位客户的这些数量的平均值？

我提供了一个示例查询来获取prod_cursor。

SELECT products.ID_PROD, products.ORDER_QTY
  FROM (SELECT sale.id_sales_order,
               sale.customer_id,
               sale.bill_address_id,
               detail.id_prod,
               detail.unit_price,
               detail.order_qty,
               detail.unit_price * detail.order_qty AS "Total Sales",
               ROW_NUMBER ()
                   OVER (ORDER BY detail.unit_price * detail.order_qty DESC)
                   AS product_rank
          FROM ex1.sales  sale
               INNER JOIN ex1gon.sales_order_detail detail
                   ON sale.ID_SALES_ORDER = detail.ID_SALES_ORDER
         WHERE sale.BILL_ADDRESS_ID = 100) products
 WHERE products.PRODUCT_RANK < 5;

Answer 1

回答你关于平均单行结果的评论，光标中所有行的值都是相同的，这取决于你如何在fetch中使用它。

您可以使用analityc功能

SELECT products.ID_PROD, products.ORDER_QTY, 
 avg(products.ORDER_QTY) over (partition by products.customer_id) AvgQnty
  FROM (SELECT sale.id_sales_order,
               sale.customer_id,
               sale.bill_address_id,
               detail.id_prod,
               detail.unit_price,
               detail.order_qty,
               detail.unit_price * detail.order_qty AS "Total Sales",
               ROW_NUMBER ()
                   OVER (ORDER BY detail.unit_price * detail.order_qty DESC)
                   AS product_rank
          FROM ex1.sales  sale
               INNER JOIN ex1gon.sales_order_detail detail
                   ON sale.ID_SALES_ORDER = detail.ID_SALES_ORDER
         WHERE sale.BILL_ADDRESS_ID = 100) products
 WHERE products.PRODUCT_RANK < 5;

如何计算游标

1 个答案: