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我需要在两个表中选择外键相互匹配,但我不想重复相同的外键。SQL SELECT不同的外键
我对数据库中的这些表:
|Photo| (0/*) --------- (1)|Advertisement| |Photo| -photo_id -url -advertisement_id |Advertisement| -advertisement_id ...
对数据库中的数据
|Photo| photo_id | url | advertisement_id 1 | x | 1 2 | x | 1 3 | x | 2 4 | x | 3
我想这一点:
ID | URL 1 | x 2 | x -> It is anyone url 3 | x
我尝试下面的SQL,但这种重复ID =(
SELECT a.advertisement_id as ID, p.url as URL FROM Advertisement a RIGHT JOIN Photo p ON a.advertisement_id = p.advertisement_id LIMIT 6
结果:
ID | URL 1 | http://i0.statig.com.br/bancodeimagens/18/46/2h/18... 2 | http://www.yaves.es/images/Animales/Tiernos-Gatito... 2 | http://images.forwallpaper.com/files/thumbs/previe... 10 | http://www.petmag.com.br/img/gatos/racas/7892/euro... 7 | http://www.gmstatic.com/content/images/1369932859_... 8 | http://www.navegandonaweb.com/wp-content/uploads/2...
任何人都帮我构造SQL查询?
使用不同的关键字ID为 – Sudarshan 2014-08-30 11:06:29