mysql日报表查询

Question

下面的查询为我提供了设备租赁公司的元素报告。这是一个 super 复杂的查询，需要将近 20 秒才能运行。这显然不是获取我正在寻找的数据的正确方法。我从 PHP 构建此查询并添加开始日期 02-01-2011 和结束日期 03-01-2011、产品代码 (p_code = 1) 和产品池 (i_pool =1)。这 4 条信息被传递到一个 PHP 函数并注入(inject)到以下 sql 中以返回我需要的报告，用于显示有多少项目已用完的日历控件。我的问题是:是否有任何方法可以简化或更好地执行此操作，或者更有效地运行，使用更好的连接或更好的方式来显示各个日期。

SELECT   DISTINCT reportdays.reportday, count(*)
FROM 
(SELECT '2011-02-01' + INTERVAL a + b DAY reportday
FROM
 (SELECT 0 a UNION SELECT 1 a UNION SELECT 2 UNION SELECT 3
    UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7
    UNION SELECT 8 UNION SELECT 9 ) d,
 (SELECT 0 b UNION SELECT 10 UNION SELECT 20 
    UNION SELECT 30 UNION SELECT 40) m 
WHERE '2011-02-01' + INTERVAL a + b DAY  <  '2011-03-01'
ORDER BY a + b) as reportdays
 JOIN rental_inv as line 
    ON DATE(FROM_UNIXTIME(line.ri_delivery_dte)) <= reportdays.reportday
  AND  DATE(FROM_UNIXTIME(line.ri_pickup_dte)) >= reportdays.reportday
 LEFT OUTER JOIN rental_in as rent on line.ri_num = rent.ri_num
 LEFT OUTER JOIN rental_cancels cancelled on rent.ri_num = cancelled.ri_num
 LEFT OUTER JOIN inv inventory on line.i_num = inventory.i_num
 LEFT OUTER JOIN product ON inventory.p_code = product.p_code
 WHERE rent.ri_extend = 0      -- disregard extended rentals
  AND cancelled.ri_num is null -- disregard cancelled rentals
  AND inventory.p_code = 1
  AND inventory.i_pool = 1

 GROUP BY reportdays.reportday

如果需要任何其他信息，请告诉我，我会发布。

Answer 1

您可以使用:

SELECT DATE(ri_delivery) as day,
       count(*) as itemsout,
  FROM rental_inv
GROUP BY day;

我不确定您是否需要这个或其他东西。

  SELECT dates.day, count (*)
    FROM rental_inv line
         INNER JOIN (SELECT DATE(ri_delivery_dte) as day FROM rental_inv  
                      WHERE ri_delivery_dte >= '2011/02/01' 
                        AND ri_delivery_dte <= '2011/02/28' 
                     GROUP BY day
                     UNION 
                     SELECT DATE(ri_pickup_dte) as day FROM rental_inv 
                      WHERE ri_pickup_dte >= '2011/02/01' 
                        AND ri_pickup_dte <= '2011/02/28'
                    GROUP BY day) dates
                 ON line.ri_delivery_dte <= dates.day and line.ri_pickup_dte >= dates.day
          LEFT JOIN rental_cancels canc on line.ri_num =  canc.ri_num 
          LEFT JOIN rental_in rent on line.ri_num = rent.ri_num
    WHERE  canc.ri_num is  null
       AND rent.ri_extend = 0
 GROUP BY dates.day