mysql - 如何将查询结果列保存到同一数据库的表中的列中

Question

我无法将此查询的结果(标题为“FIPminus”的列)复制到同一数据库中的starting_pitcher_stats 表中。

当我运行以下代码时，结果如下面代码下方的屏幕截图所示。但是，当我在 ALTER TABLE 语句下面使用 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

这是我要复制到的表结构的屏幕截图:

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

提前谢谢您。

更新:这是有效的代码，但运行时间长得离谱:

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)

Answer 1

据我了解，您已经在表 FIPminus 中填充了您现在需要更新 starting_pitcher_stats 表的值。

您可以在 UPDATE 命令中使用 JOIN 语法。

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!)，其中将包括在两个表上进行比较时使用的列:

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 speed of UPDATE statements并决定它是否与您相关。