Question

让我开始说我有以下两个表：

赛程表：

| straightred_fixture | CREATE TABLE `straightred_fixture` (
  `fixtureid` int(11) NOT NULL,
  `hometeamscore` int(11) DEFAULT NULL,
  `awayteamscore` int(11) DEFAULT NULL,
  `homegoaldetails` longtext,
  `awaygoaldetails` longtext,
  `awayteamid` int(11) NOT NULL,
  `hometeamid` int(11) NOT NULL,
  PRIMARY KEY (`fixtureid`),
  KEY `straightred_fixture_2e879a39` (`awayteamid`),
  KEY `straightred_fixture_bcb6decb` (`hometeamid`),
  KEY `straightred_fixture_d6d641f1` (`soccerseasonid`),
  KEY `straightred_fixture_fixturematchday2_f98c3a75_uniq` (`fixturematchday`),
  CONSTRAINT `D9b896edf0aff4d9b5c00682a8e21ea3` FOREIGN KEY (`fixturematchday`) REFERENCES `straightred_fixturematchday` (`fixturematchdayid`),
  CONSTRAINT `straightr_soccerseasonid_92496b92_fk_straightred_season_seasonid` FOREIGN KEY (`soccerseasonid`) REFERENCES `straightred_season` (`seasonid`),
  CONSTRAINT `straightred_fixtu_awayteamid_3d1961ba_fk_straightred_team_teamid` FOREIGN KEY (`awayteamid`) REFERENCES `straightred_team` (`teamid`),
  CONSTRAINT `straightred_fixtu_hometeamid_6e37e94b_fk_straightred_team_teamid` FOREIGN KEY (`hometeamid`) REFERENCES `straightred_team` (`teamid`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |

团队表：

| straightred_team | CREATE TABLE `straightred_team` (
  `teamid` int(11) NOT NULL,
  `teamname` varchar(36) NOT NULL,
  `country` varchar(36) DEFAULT NULL,
  `stadium` varchar(36) DEFAULT NULL,
  `homepageurl` longtext,
  `wikilink` longtext,
  `teamcode` varchar(5) DEFAULT NULL,
  `teamshortname` varchar(24) DEFAULT NULL,
  `currentteam` smallint(5) unsigned DEFAULT NULL,
  PRIMARY KEY (`teamid`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 |

查询：：

select hometeamid as team, awayteamid as opponent, hometeamscore as team_score, awayteamscore as opponent_score, 
(case  when (hometeamscore-awayteamscore)>0 then 'W' when (hometeamscore-awayteamscore)<0 then 'L' ELSE 'D' END) as result, 'home' as mstatus
from straightred_fixture sf, straightred_team st;

我想要做的是返回团队名称而不是上面查询中团队的ID。我意识到需要某种加入，但我让自己陷入了混乱。

Answer 1

你需要加入球队表两次，一次是主队，一次是客队：

SELECT home.teamname AS team, 
       away.teamname AS opponent, 
       hometeamscore AS team_score, 
       awayteamscore AS opponent_score, 
       CASE WHEN (hometeamscore - awayteamscore) > 0 then 'W'
            WHEN (hometeamscore - awayteamscore) < 0 then 'L' 
            ELSE 'D' 
       END AS result, 
       'home' AS mstatus
FROM   straightred_fixture sf
JOIN   straightred_team home ON hometeamid = home.teamid
JOIN   straightred_team away ON awayteamid = away.teamid

Answer 2

根据我的经验，我的建议可能是您不喜欢的（我将其作为答案，因为评论太长了。

在我看来/经验这里是你需要做的。你需要打破固定装置表。

灯具表应该具有特定于灯具本身的信息（日期，时间，可能是其他特定信息）

相关的表可以称为fixture_participants并包含团队信息 - 每个灯具在灯具参与者中有两行。

在我的解决方案中，我创建了一个主页/主页＆＃39;以H / A表示，以W / L表示的赢/输（现在考虑整数可能是更好的解决方案）。我认为这是欧洲足球所以你应该列出一个得分目标栏。

因此，您现在可以轻松识别主队和客队，您只需要撰写稍微复杂一些的查询，但您也可以说“A队在路上的平均进球数是多少？＆＃39;更容易。

PS - 如果您需要我正在谈论的this repository的样本为美国篮球建立类似的表关系

SQL：链接两个表

2 个答案: