OrientDB：别名不起作用？

Question

'早上好！

我注意到查询中别名的奇怪行为：我执行了这个查询（注意 WHERE 子句中别名的使用）

SELECT traversedElement(1).start AS stime, traversedElement(2) AS destination 
FROM (TRAVERSE both('Involves') FROM #11:11052 WHILE $depth <= 2)
WHERE @rid = #11:8395 
AND stime = DATE('31.10.2014 11:00:00')

我得到了一个空结果，同时避免在 WHERE 子句中使用 stime 别名导致查询产生正确的结果。

SELECT traversedElement(1).start AS stime, traversedElement(2) AS destination 
FROM (TRAVERSE both('Involves') FROM #11:11052 WHILE $depth <= 2)
WHERE @rid = #11:8395 
AND traversedElement(1).start = DATE('31.10.2014 11:00:00')

有人知道这是怎么回事吗？ WHERE 子句中是否不处理别名？

Answer 1

@阿尔贝托如果您使用别名，您不能立即在 where 子句中使用它。您有两种不同的方式来执行查询

1)

 select from (SELECT traversedElement(1).start AS stime, traversedElement(2) AS destination 
    FROM (TRAVERSE both('Involves') FROM #11:11052 WHILE $depth <= 2)
    WHERE @rid = #11:8395) where stime = DATE('31.10.2014 11:00:00')

2)

select start as stime,destination from (SELECT traversedElement(1).start, traversedElement(2) AS destination 
FROM (TRAVERSE both('Involves') FROM #11:11052 WHILE $depth <= 2)
WHERE @rid = #11:8395 AND traversedElement(1).start = DATE('31.10.2014 11:00:00'))

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