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Appendix 3. Chronicles of Torus

Author: Bezhaev A.Yu.

The site sql-ex.ru presents several tasks, connected with the mythical planet by the name Torus. This paragraph gives a brief introduction to planet topology and explains terminology.

In mathematical sense, torus is a surface of revolution generated by revolving a circle in three-dimensional space (see http://en.wikipedia.org/wiki/Torus). It has a bagel (boublik) form.

Torus

If you use Google Chrome. That:
1.Copy this chrome://plugins/ in your address bar
2.Press button "detals" and switch off Flash player 10.

Get Adobe Flash player

We hope that flash-presentation will help realize more accurately the mutual displacement of countries TIJ and successfully solve the relevant exercises at sql-ex.ru. :-)

Keys (qwe, asd, ->, <-) are intended for rotation of the torus, whereas Up/Down keys make zooming. Click on country region within a torus to rewrite rectangular Mercadot map.

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aggregate functions Airport ALL AND AS keyword ASCII AVG Battles Bezhaev Bismarck C.J.Date calculated columns Cartesian product CASE cast CHAR CHARINDEX Chebykin check constraint classes COALESCE common table expressions comparison predicates Computer firm CONVERT correlated subqueries COUNT CROSS APPLY CTE data type conversion data types database schema date/time functions DATEADD DATEDIFF DATENAME DATEPART DATETIME DDL DEFAULT DEFAULT VALUES DELETE DISTINCT DML duplicates EXCEPT exercise (-2) exercise 19 exercise 23 exercise 32 More tags
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