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| Grouping by aggregates in SQL | 27 Apr 2009 22:11 GMT | 4 |
c.d.t. is the wrong forum to ask this question, but I reckon it's a good place to find folk who've Got a Clue (tm). :-) Which SQL dialects have you encountered that support aggregates in the GROUP BY clause?
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| general design issue | 25 Apr 2009 18:13 GMT | 30 |
i don't know much about SQL - just basics: tables, indexes, simple selects and i'm designing simple database storing key/value data (in fact its read
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| Sub-query on Calculated Field Problem | 23 Apr 2009 18:40 GMT | 1 |
I am working with a database that tracks sector scores for economic data. There are five sectors that are scored for geography entities. A scoring record is entered for each geo entity for every month. I need to find the highest Total Score (=Sect1Score + Sect2Score ... +
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| help with nested set | 20 Apr 2009 18:20 GMT | 11 |
I am working on a data model that uses a nested set in MySQL. I'm semi- aware of the relational and other shortcomings of MySQL; please forgive me if discussion of the platform is verboten here. I have a problem that I believe is a general RDBMS problem; if it is instead a
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| a union is always a join! | 09 Apr 2009 14:28 GMT | 114 |
Criticisms, please (preferably ones based on some formal logic or other). It is inescapable that every relation is a join (eg., Heath's theorem). So every relvar points to a join. If we can't 'delete' through a join, we can't delete from any relvar (my father, who thought a disk ...
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| Relational query with path expressions | 08 Apr 2009 06:40 GMT | 19 |
I get the impression that a lot of the time, a query (or a large portion of a query) can be thought of as a navigation from attribute to attribute using a sequence of joins. This made me think there may be some merit in thinking of attribute names as global in nature and
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