＃1066 - 不是唯一的表/別名：

Question

你能幫我一把。我有這樣的SQL查詢：

SELECT l.url 
FROM (b INNER JOIN links ON b.parent_id = l.id) 
INNER JOIN b ON l.id = b.link 
WHERE l.url LIKE 'http://domain%' LIMIT 0, 30 

而且不知何故，說

#1066 - Not unique table/alias: b 

Answer 1

你似乎是從同一個表中選擇兩次。所有這些事件都需要它自己的別名：

SELECT 
    l.url 
FROM 
    b as b1 /* <-- */ 
    INNER JOIN links as l 
     ON b1.parent_id = l.id 
    INNER JOIN b as b2 /* <-- */ 
     ON l.id = b2.link 
WHERE l.url LIKE 'http://domain%' LIMIT 0, 30 

請注意，我還添加缺少的別名l爲links表。

Answer 2

SELECT l.url from b inner join links as l on l.id = l.parent_id 
inner join b as b1 on b1.link = l.id 
where l.url like 'http:domain%' limit 0,30 

在此查詢WE R連接兩個表第一B和第二環節和自我JOIN B爲B1別名OK