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sql - statement: building differences between data-sets

From: beyond <rudi.ramstein_at_gmx.de>
Date: 3 Aug 2004 13:17:01 -0700
Message-ID: <621ad8ac.0408031217.41fc6fc3_at_posting.google.com> 





i need a sql-statement for this problem



i ve got a table like this


ID;value

1;30
2;34
3;44





the result of sql-statement should calculate differences to
previous/other datasets like this


ID;diff

1; 30-0
2; 34-30
3; 44-34





who can solve this problem elegant?
Received on Tue Aug 03 2004 - 22:17:01 CEST












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