我需要連接來(lái)自三張不同表格的三列,

捐款表：

+-----------+---------------------+

| record_id | contributor_user_id |

+-----------+---------------------+

| 1 | 2 |

+-----------+---------------------+

| 1 | 5 |

+-----------+---------------------+

會(huì)員表：

+--------------+---------+

| username | user_id |

+--------------+---------+

| Test | 1 |

+--------------+---------+

| Test2 | 5 |

+--------------+---------+

| Test3 | 6 |

+--------------+---------+

記錄表：

+---------+-----------+

| user_id | record_id |

+---------+-----------+

| 28 | 1 |

+---------+-----------+

對(duì)于我需要返回的是用于顯示記錄所有者的用戶名和user_id.另外,顯示用戶名和user_id,但是可以是多個(gè)(超過(guò)1個(gè)用戶).我已經(jīng)試過(guò)了：

SELECT usr.username,

usr.user_id,

rec.record_id,

contrib.record_id,

contrib.contributor_user_id

FROM

(

records rec

INNER JOIN members usr ON rec.user_id = usr.user_id

# this returns records as NULL

LEFT OUTER JOIN contributions contrib ON rec.record_id = contrib.record_id AND contrib.contributor_user_id = usr.user_id

# this works, but I need the username to be displayed too

LEFT OUTER JOIN contributions contrib ON rec.record_id = contrib.record_id

)

WHERE rec.record_id = 1

總結(jié)

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