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我很难将此查询的结果（标题为“FIPminus”的列）复制到我在同一个数据库中的表starting_pitcher_stats 中。

当我运行以下代码时，结果显示在下面代码下方的屏幕截图中。但是，当我在 ALTER TABLE 语句下方使用 UPDATE 语句时，如以下线程中所述，我不断收到以下错误：

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SELECT 
IF(s.HomeAway_CD ='Home'

stackoverflow.com/questions/13317838/how-to-insert-a-query-result-into-a-column-mysql 

ALTER TABLE starting_pitcher_stats ADD COLUMN FIPminus DOUBLE;
    SELECT 
    IF(s.HomeAway_CD ='Home'
    ,((((13*s.HR_a)+(3*(s.walks_a+s.HBP))-(2*s.strike_outs))/s.innings_pitched + g.cFIP + (((13*s.HR_a)+(3*(s.walks_a+s.HBP))-(2*s.strike_outs))/s.innings_pitched + g.cFIP - (((13*s.HR_a)+(3*(s.walks_a+s.HBP))-(2*s.strike_outs))/s.innings_pitched + g.cFIP * (p.Basic_PF/100))))/(b.FIP)*100)
    ,(((13*s.HR_a)+(3*(s.walks_a+s.HBP))-(2*s.strike_outs))/s.innings_pitched + g.cFIP/(b.FIP)*100)) AS FIPminus
    FROM starting_pitcher_game_log AS s
    INNER JOIN GUTS AS g
       ON s.YEAR_ID=g.YEAR_ID  
    INNER JOIN Park_Factors AS p
       ON s.YEAR_ID=p.YEAR_ID AND s.FLD_TEAM_ID=p.Team_ID
    INNER JOIN AL_NL_MLB_lg_avg_pitcher_stats AS b
       ON s.YEAR_ID=b.YEAR_ID AND s.lg_ID=b.lg_ID WHERE b.pitcher_type='starter'
    GROUP BY s.Starting_Pitcher, s.GAME_ID

在此处输入图像描述

这是我要复制到的表结构的屏幕截图：

在此处输入图像描述

更新：这是我与产生错误的 UPDATE 语句一起使用的代码：

ALTER TABLE starting_pitcher_stats ADD COLUMN FIPminus DOUBLE;
UPDATE starting_pitcher_stats
SELECT 
IF(s.HomeAway_CD ='Home'
,((((13*s.HR_a)+(3*(s.walks_a+s.HBP))-(2*s.strike_outs))/s.innings_pitched + g.cFIP + (((13*s.HR_a)+(3*(s.walks_a+s.HBP))-(2*s.strike_outs))/s.innings_pitched + g.cFIP - (((13*s.HR_a)+(3*(s.walks_a+s.HBP))-(2*s.strike_outs))/s.innings_pitched + g.cFIP * (p.Basic_PF/100))))/(b.FIP)*100)
,(((13*s.HR_a)+(3*(s.walks_a+s.HBP))-(2*s.strike_outs))/s.innings_pitched + g.cFIP/(b.FIP)*100)) AS FIPminus
FROM starting_pitcher_game_log AS s
INNER JOIN GUTS AS g
   ON s.YEAR_ID=g.YEAR_ID  
INNER JOIN Park_Factors AS p
   ON s.YEAR_ID=p.YEAR_ID AND s.FLD_TEAM_ID=p.Team_ID
INNER JOIN AL_NL_MLB_lg_avg_pitcher_stats AS b
   ON s.YEAR_ID=b.YEAR_ID AND s.lg_ID=b.lg_ID WHERE b.pitcher_type='starter'
GROUP BY s.Starting_Pitcher, s.GAME_ID

先感谢您。

更新：这是有效的代码，但运行时间非常长：

ALTER TABLE starting_pitcher_stats ADD COLUMN FIPminus DOUBLE;
UPDATE starting_pitcher_stats AS s
SET FIPminus = (SELECT f.FIPminus FROM FIPminus AS f
WHERE s.Starting_Pitcher=f.Starting_Pitcher AND s.GAME_ID=f.GAME_ID)
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1 回答 1

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据我了解，您已经FIPminus使用您现在需要更新starting_pitcher_stats表的值填充了您的表。

您可以在命令中使用JOIN语法。UPDATE

UPDATE 
  starting_pitcher_stats AS s
  INNER JOIN FIPminus AS f ON 
    s.Starting_Pitcher = f.Starting_Pitcher AND s.GAME_ID = f.GAME_ID
SET FIPminus = f.FIPminus

如果您的查询对您来说运行速度相对较慢，请考虑创建索引（在运行更新之前！），其中将包括两个表上用于比较的列：

ALTER TABLE FIPminus ADD INDEX (Starting_Pitcher, GAME_ID);
ALTER TABLE starting_pitcher_stats ADD INDEX (Starting_Pitcher, GAME_ID);

您还可以阅读有关UPDATE 语句的速度并决定它是否与您相关。

于 2016-02-21T19:10:16.137 回答