MYSQL加入选择查询

Question

我正在编写一个数据库来管理体育联赛表，该数据库需要一个单独的表来保存偶尔出现的积分变化的细节，这些变化不在联赛表计算的正常逻辑范围内。

我有两个表

    CREATE TABLE IF NOT EXISTS `fixtures` (
  `id` int(6) unsigned NOT NULL AUTO_INCREMENT,
  `comp_id` int(6) NOT NULL,
  `date` date DEFAULT NULL,
  `time` time DEFAULT NULL,
  `hteam_id` int(6) DEFAULT NULL,
  `ateam_id` int(6) DEFAULT NULL,
  `hscore1` int(6) DEFAULT NULL,
  `ascore1` int(6) DEFAULT NULL,
  `hscore2` int(6) DEFAULT NULL,
  `ascore2` int(6) DEFAULT NULL,
  `hbonus` int(6) NOT NULL,
  `abonus` int(6) NOT NULL,
  `played` varchar(2) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=30 ;

CREATE TABLE IF NOT EXISTS `pointsadjust` (
  `id` int(6) unsigned NOT NULL AUTO_INCREMENT,
  `fix_id` int(6) DEFAULT NULL,
  `team_id` int(6) DEFAULT NULL,
  `value` int(6) DEFAULT NULL,
  `reason` varchar(75) CHARACTER SET latin1 COLLATE latin1_general_ci DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ;

我用来汇总排名表的查询是

SELECT
  tname AS Team, Sum(P) AS P,Sum(W) AS W,Sum(D) AS D,Sum(L) AS L,
  SUM(F) as F,SUM(A) AS A,SUM(SD) AS SD,SUM(BP) AS BP,SUM(Pts)+SUM(BP) AS Pts, SUM(((Pts+BP)*10000)+(W*100)+(SD*10)+((F/P)*1)) AS Rank
FROM(
  SELECT
    hteam_id Team,
    1 P,
    IF(hscore1 > ascore1,1,0) W,
    IF(hscore1 = ascore1,1,0) D,
    IF(hscore1 < ascore1,1,0) L,
    hscore1 F,
    ascore1 A,
    hscore1-ascore1 SD,
    hbonus BP,
    CASE WHEN hscore1 > ascore1 THEN 2 WHEN hscore1 = ascore1 THEN 1 ELSE 0 END PTS
  FROM fixtures WHERE comp_id = '1' AND played = 'N'
  UNION ALL
  SELECT
    ateam_id,
    1,
    IF(hscore1 < ascore1,1,0),
    IF(hscore1 = ascore1,1,0),
    IF(hscore1 > ascore1,1,0),
    ascore1,
    hscore1,
    ascore1-hscore1,
    abonus,
    CASE WHEN hscore1 < ascore1 THEN 2 WHEN hscore1 = ascore1 THEN 1 ELSE 0 END
  FROM fixtures WHERE comp_id = '1' AND played = 'N'
) as tot
JOIN teams t ON tot.Team=t.id
GROUP BY Team
ORDER BY Rank DESC

我正在努力创建第二个联接，以从积分调整表中引入数据以对联赛表进行调整。

有人可以帮忙吗？

Answer 1

最好的方法是为此替换子查询“ tot”的代码块，并指向新列“ Pts_Adjst”（巫婆保留调整后的标点符号），而不是“ Pts”（“香草”标点符号） ：

SQL提琴（示例）： http ://sqlfiddle.com/#!9/c7a3c/14

SELECT
#tname AS Team,
Team TeamiD,
Sum(P) AS P,Sum(W) AS W,Sum(D) AS D,Sum(L) AS L,
SUM(F) as F,SUM(A) AS A,SUM(SD) AS SD,SUM(BP) AS BP,SUM(Pts_Adjst)+SUM(BP) AS Pts, SUM(((Pts_Adjst+BP)*10000)+(W*100)+(SD*10)+((F/P)*1)) AS Rank
FROM(SELECT tot.*, CASE WHEN pointsadjust.value is not null THEN pointsadjust.value ELSE PTS END PTS_ADJST, pointsadjust.reason FROM (
SELECT
 hteam_id Team,
 id Fix,
 1 P,
 IF(hscore1 > ascore1,1,0) W,
 IF(hscore1 = ascore1,1,0) D,
 IF(hscore1 < ascore1,1,0) L,
 hscore1 F,
 ascore1 A,
 hscore1-ascore1 SD,
 hbonus BP,
 CASE WHEN hscore1 > ascore1 THEN 2 WHEN hscore1 = ascore1 THEN 1 ELSE 0 END PTS
FROM fixtures WHERE comp_id = '1' AND played = 'N'
UNION ALL
SELECT
 ateam_id,
 id Fix,
 1,
 IF(hscore1 < ascore1,1,0),
 IF(hscore1 = ascore1,1,0),
 IF(hscore1 > ascore1,1,0),
 ascore1,
 hscore1,
 ascore1-hscore1,
 abonus,
 CASE WHEN hscore1 < ascore1 THEN 2 WHEN hscore1 = ascore1 THEN 1 ELSE 0 END
 FROM fixtures WHERE comp_id = '1' AND played = 'N'
) as tot
LEFT JOIN pointsadjust 
ON tot.Team = pointsadjust.team_id AND tot.Fix = pointsadjust.Fix_id) as tot
#JOIN teams t ON tot.Team=t.id
GROUP BY Team
ORDER BY Rank DESC