The order of a SQL Select statement without Order By clause

Posted by Yousui on Stack Overflow See other posts from Stack Overflow or by Yousui
Published on 2012-04-08T16:48:08Z Indexed on 2012/04/08 17:30 UTC
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As I know, from the relational database theory, a select statement without an order by clause should be considered has not particular order. But actually in SQL Server and Oracle (I've tested on those 2 platforms), if I query from a table without an order by clause multiple times, I always get the results in the same order. Does this behavior can be relied on? Anyone can help to explain a little?

Thanks!

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