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[英]How to join 2 columns in a SQL table to one column in another SQL table?
[英]SQL join - one column serving as ID for two columns in another table
好的,也許我已經完全沉迷於此背后的思考過程,而我需要放在我的位置,或者也許我就在不遠處。
我有一個名為TEAMS的表,其中有兩列:teamID和teamName。 然后,我還有另一個名為WEEK12的表,該表具有三列:gameID,homeID和awayID。
我以為也許可以在WEEK12表的homeID和awayID列中使用teamID,然后將其與TEAMS表結合起來,以使這兩列與團隊名稱匹配。 不幸的是,我沒有任何運氣。 我可以加入並獲得與homeID或awayID匹配的團隊名稱,但是我不能兩者都做。
任何幫助是極大的贊賞!
SELECT w.gameID,
h.teamName AS 'Home Team',
a.teamName AS 'Away Team'
FROM WEEK12 AS w
LEFT JOIN TEAMS AS h
ON w.homeID=h.teamID
LEFT JOIN TEAMS AS a
ON w.awayID=a.teamID
您應該能夠在同一查詢中兩次連接到同一表。 性能受到影響(兩次查詢),但是應該可以。
SELECT home.teamName as homeTeam, away.teamName as awayTeam, week.gameID
FROM week12 week
INNER JOIN teams home ON week.homeID = home.teamID
INNER JOIN teams away ON week.awayID = away.teamID
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