需要帮助将列添加到一个 table 使用函数在两个单独的 table 的列之间进行算术运算

Question

我正在尝试使用 sequel-pro 将列 "wOBA" 添加到 MySQL 中的 table "starting_pitcher_stats"。下面是对 "starting_pitcher_stats" table 中的九个变量执行算术运算的函数代码。特别是，该函数收集多个变量的值，对其中一些变量（下面的分子）应用不同的权重（系数），并将该总和除以更多变量的加法和减法。所有这些变量都驻留在 "starting_pitcher_stats" table 中。算术运算用以下公式表示（系数是乘以下面分子中每个变量的值）：

wOBA=(.69*walks_a + .72*HBP + .89*singles_a + 1.27*doubles_a + 1.62*triples_a+ 2.10*HR_a)/(at_bats+walks_a+SF+HBP)

每个重量因年份而异。每年的不同权重来自 table "GUTS".

我遇到的第一个难题是获取函数的正确代码。第二个是用于实际调用此函数的正确代码语法，并为每个 "Starting_Pitcher".

每年（赛季）的每场比赛使用正确的加权 wOBA 值填充新列

该函数是用下面的代码创建的，并在我的函数和过程列表中列为函数 "wOBA"。但是，sequel pro 中函数名称旁边的小 wheel/knob 由于某种原因显示为灰色。直到我找到调用它的正确代码，我才会知道是否有任何错误。

请询问我可以提供的更多信息以澄清任何问题。

提前致谢。

DELIMITER $$
    CREATE FUNCTION wOBA(wOBA DECIMAL(10,3))
    RETURNS DECIMAL(10,3)
    BEGIN
        DECLARE wOBA decimal(10,3);
        SET wOBA = 0;
        SELECT cast((SELECT SUM(weighted_BB) as wBB_sum 
            FROM (
                SELECT g.wBB*SUM(if(e.event_CD=14,1,0)) as weighted_BB 
                FROM events e 
                INNER JOIN GUTS g 
                    ON substring(e.game_ID,4,4)=g.season 
                WHERE PIT_ID=Starting_Pitcher 
                GROUP BY g.season) 
            as walks_a)  
            + (SELECT SUM(weighted_HBP) as wHBP_sum 
            FROM (
                SELECT g.wHBP*SUM(if(e.event_CD=16,1,0)) as weighted_HBP 
                FROM events e 
                INNER JOIN GUTS g 
                    ON substring(e.game_ID,4,4)=g.season 
                WHERE PIT_ID=Starting_Pitcher 
                GROUP BY g.season) 
            as HBP)     
            + (SELECT SUM(weighted_1B) as w1B_sum 
            FROM (
                SELECT g.w1B*SUM(if(e.event_CD=20,1,0)) as weighted_1B 
                FROM events e 
                INNER JOIN GUTS g 
                    ON substring(e.game_ID,4,4)=g.season 
                WHERE PIT_ID=Starting_Pitcher 
                GROUP BY g.season) 
            as singles_a)       
            + (SELECT SUM(weighted_2B) as w2B_sum 
            FROM ( 
                SELECT g.w2B*SUM(if(e.event_CD=21,1,0)) as weighted_2B 
                FROM events e 
                INNER JOIN GUTS g 
                    ON substring(e.game_ID,4,4)=g.season 
                WHERE PIT_ID=Starting_Pitcher 
                GROUP BY g.season) 
            as doubles_a)       
            + (SELECT SUM(weighted_3B) as w3B_sum 
            FROM (
                SELECT g.w3B*SUM(if(e.event_CD=22,1,0)) as weighted_3B 
                FROM events e 
                INNER JOIN GUTS g 
                    ON substring(e.game_ID,4,4)=g.season 
                WHERE PIT_ID=Starting_Pitcher 
                GROUP BY g.season) 
            as triples_a)       
            + (SELECT SUM(weighted_HR) as wHR_sum 
            FROM (
                SELECT g.wHR*SUM(if(e.event_CD=23,1,0)) as weighted_HR 
                FROM events e 
                INNER JOIN GUTS g 
                    ON substring(e.game_ID,4,4)=g.season 
                WHERE PIT_ID=Starting_Pitcher 
                GROUP BY g.season) 
            as HR_a) as decimal(10,3))
            /
            cast(SUM(if(e.ab_fl="T",1,0)) 
                + SUM(if(e.event_cd=14,1,0)) 
                + SUM(if(e.SF_fl="T",1,0)) 
                + SUM(if(e.event_cd=16,1,0)) as unsigned) INTO wOBA 
            FROM events e
            WHERE e.PIT_ID=Starting_Pitcher AND PIT_START_FL = "T"
            LIMIT 1;
        RETURN wOBA;
    END
    $$
    DELIMITER ;

Darwin，这是 events table 的两个屏幕截图。第一个是结构，第二个是一些内容（因为不是所有的内容都适合镜头）：

[

以下是 GUTS table.

的结构和内容的屏幕截图

这是事件 table 结构的屏幕截图，显示了函数中的字段（及其定义）：

更新：

UPDATE retrosheet.starting_pitcher_stats 
SET starting_pitcher_stats.wOBA =(SELECT
(
   (g.wBB * SUM(IF(e.event_cd = 14, 1, 0)))
   + (g.wHBP * SUM(IF(e.event_cd = 16, 1, 0)))
   + (g.w1B  * SUM(IF(e.event_cd = 20, 1, 0)))
   + (g.w2B  * SUM(IF(e.event_cd = 21, 1, 0)))
   + (g.w3B  * SUM(IF(e.event_cd = 22, 1, 0)))
   + (g.wHR  * SUM(IF(e.event_cd = 23, 1, 0)))
   )
   /
   (
     SUM(IF(e.ab_fl = 'T',   1, 0))
   + SUM(IF(e.event_cd = 14, 1, 0))
   + SUM(IF(e.sf_fl = 'T',   1, 0))
   + SUM(IF(e.event_cd = 16, 1, 0))
  ) AS wOBA
  FROM events AS e, GUTS AS g
  WHERE e.YEAR_ID = g.SEASON_ID
    AND e.PIT_START_FL= 'T'
    AND e.PIT_ID = Starting_Pitcher)

查询只保留运行ning。我会继续调整它。

更新： starting_pitcher_stats table 的屏幕截图

更新：

好的，我正在尝试创建一个 wOBA 列作为新 table 的一部分，其中包含 wOBA 其他组件的列。

但是，查询一直在进行。如何缩短运行时间？

DROP TABLE IF EXISTS starting_pitcher_wOBA;
CREATE TABLE starting_pitcher_wOBA 
SELECT
a.YEAR_ID
,
a.GAME_ID
,
a.PIT_ID
,
a.wBB
,
a.wHBP
,
a.w1B
,
a.w2B
,
a.w3B
,
a.wHR
,
a.u_walks_a
,
a.HBP
,
a.singles_a
,
a.doubles_a
,
a.triples_a
,
a.HR_a
,
a.at_bats
,
a.sacrifice_flies_a
,
a.wOBA
FROM
(
SELECT 
g.YEAR_ID
,
h.GAME_ID
,
e.PIT_ID
,
g.wBB
,
g.wHBP
,
g.w1B
,
g.w2B
,
g.w3B
,
g.wHR
,
SUM(IF(e.event_cd = 14, 1, 0)) AS u_walks_a
,
SUM(IF(e.event_cd = 16, 1, 0)) AS HBP
,
SUM(IF(e.event_cd = 20, 1, 0)) AS singles_a
,
SUM(IF(e.event_cd = 21, 1, 0)) AS doubles_a
,
SUM(IF(e.event_cd = 22, 1, 0)) AS triples_a
,
SUM(IF(e.event_cd = 23, 1, 0)) AS HR_a
,
SUM(IF(e.ab_fl = 'T',   1, 0)) AS at_bats
,
SUM(IF(e.sf_fl = 'T',   1, 0)) AS sacrifice_flies_a
,
(
(
   (g.wBB * SUM(IF(e.event_cd = 14, 1, 0))) 
   + (g.wHBP * SUM(IF(e.event_cd = 16, 1, 0))) 
   + (g.w1B  * SUM(IF(e.event_cd = 20, 1, 0))) 
   + (g.w2B  * SUM(IF(e.event_cd = 21, 1, 0))) 
   + (g.w3B  * SUM(IF(e.event_cd = 22, 1, 0))) 
   + (g.wHR  * SUM(IF(e.event_cd = 23, 1, 0))) 
   )
   /
   (
     SUM(IF(e.ab_fl = 'T',   1, 0)) 
   + SUM(IF(e.event_cd = 14, 1, 0)) 
   + SUM(IF(e.sf_fl = 'T',   1, 0)) 
   + SUM(IF(e.event_cd = 16, 1, 0)) 
  ) 
 )  AS wOBA
FROM events AS e, GUTS AS g, game AS h
WHERE e.PIT_START_FL= 'T' 
GROUP BY g.YEAR_ID, h.GAME_ID,e.PIT_ID) AS a
INNER JOIN GUTS AS g
ON 
a.YEAR_ID=g.YEAR_ID
INNER JOIN game AS h
ON
a.GAME_ID = h.GAME_ID
INNER JOIN events AS e
ON
a.PIT_ID = e.PIT_ID

Answer 1

我们将从清理查询开始。您应该尽可能尝试在每一行上执行计算，而不是执行多个垂直子查询，因为这可以避免 DBMS 对相同的 table.

进行多次传递

SELECT
  (
   ( (g.wbb  * SUM(IF(e.event_cd = 14, 1, 0)))
   + (g.whbp * SUM(IF(e.event_cd = 16, 1, 0)))
   + (g.w1b  * SUM(IF(e.event_cd = 20, 1, 0)))
   + (g.w2b  * SUM(IF(e.event_cd = 21, 1, 0)))
   + (g.w3b  * SUM(IF(e.event_cd = 22, 1, 0)))
   + (g.whr  * SUM(IF(e.event_cd = 23, 1, 0)))
   )
   /
   (
     SUM(IF(e.ab_fl = 'T',   1, 0))
   + SUM(IF(e.event_cd = 14, 1, 0))
   + SUM(IF(e.sf_fl = 'T',   1, 0))
   + SUM(IF(e.event_cd = 16, 1, 0))
   )
  ) AS woba
  FROM events e, guts g
  WHERE e.year_id = g.season_id
    AND e.pit_start_fl = 'T'
    AND e.pit_id = starting_pitcher
  GROUP BY g.season;

假设我没有在某处留下逗号，这将为指定的首发投手每年 return 一列 woba。

请注意，我在 e.year_id 而不是 SUBSTRING(e.game_ID,4,4) 加入了 table；这避免了在每条记录上调用 SUBSTRING() 的开销。这种事情看似微不足道，但它可以在一个大 table.

上迅速加起来

这应该足以让您入门。

需要帮助将列添加到一个 table 使用函数在两个单独的 table 的列之间进行算术运算

need help adding column to one table using function that does arithmetic operations between columns from two separate tables

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stored-procedures

call

stored-functions