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你好,任何人都可以看到为什么这个查询失败?帮助加入查询(MySQL)
SELECT A.idAd, A.ads_in_Cat, A.title, A.currency, A.price,
A.in_dpt, A.description, A.featured FROM ads A
LEFT JOIN featured F ON F.ad = A.idAd
INNER JOIN dept D ON D.id_dept = A.in_dpt
INNER JOIN sub_cat_ad S ON S.id_sub_cat = A.ads_in_Cat
INNER JOIN cat_ad C ON C.idCat_ad = S.from_cat_ad
ORDER BY A.featured DESC LIMIT :limit, :offset
但是这一个工程:
SELECT *FROM ads
LEFT JOIN featured ON featured.ad = ads.idAd
INNER JOIN dept ON dept.id_dept = ads.in_dpt
INNER JOIN sub_cat_ad ON id_sub_cat = ads.ads_in_Cat
INNER JOIN cat_ad ON idCat_ad = sub_cat_ad.from_cat_ad
ORDER BY featured DESC LIMIT :limit, :offset
在第一个,我不想从表中“广告”的所有列,查询将返回唯一列,直到... FROM广告A.
它怎么会失败呢?我想这只是一些例子,因为这些连接似乎已经过时了。 – Bobby 2010-07-31 22:12:09
你是什么意思失败?它给出了一个错误?或者你期待那些没有被返回的列?如果是这样的列和哪些表? – 2010-07-31 22:12:24
@马丁史密斯,在第一个,从广告A,它不选择加入列 – jartaud 2010-07-31 22:17:35