查询复杂sql的表的大小
explain plan for WITH sales_countries AS(SELECT /*+ gather_plan_statistics */
cu.cust_id, co.country_name
FROM sh.countries co, sh.customers cu
WHERE cu.country_id = co.country_id),
top_sales AS
(SELECT p.prod_name,
sc.country_name,
s.channel_id,
t.calendar_quarter_desc,
s.amount_sold,
s.quantity_sold
FROM sh.sales s
JOIN sh.times t
ON t.time_id = s.time_id
JOIN sh.customers c
ON c.cust_id = s.cust_id
JOIN sales_countries sc
ON sc.cust_id = c.cust_id
JOIN sh.products p
ON p.prod_id = s.prod_id),
sales_rpt AS
(SELECT prod_name product,
country_name country,
channel_id channel,
substr(calendar_quarter_desc, 6, 2) quarter,
SUM(amount_sold) amount_sold,
SUM(quantity_sold) quantity_sold
FROM top_sales
GROUP BY prod_name,
country_name,
channel_id,
substr(calendar_quarter_desc, 6, 2))
SELECT *
FROM (SELECT product, channel, quarter, country, quantity_sold
FROM sales_rpt) pivot(SUM(quantity_sold) FOR(channel, quarter) IN((5, '02') AS
catalog_q2,
(4, '01') AS
internet_q1,
(4, '04') AS
internet_q4,
(2, '02') AS
partners_q2,
(9, '03') AS
tele_q3))
46 ORDER BY product, country
47/
Explained.
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