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Use SQL to generate large data sequence

, 19 Feb 2015 CPOL 10.2K 6
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Generate large data series by using Cartesian Product and small data table

The proposed solution demonstrates the concept of generating a large data series by using structured query language (SQL) and relatively small data tables, thus dramatically reducing the overall 'digital footprint' (rather important design consideration for any mobile/compact/embedded solutions).
 
Sample coding technique to demonstrate the concept utilizes a small table (Table1) with just 10 records, containing integer numbers: 0,1,2,3,...9, and a single SQL query to generate a virtual time line, which spans for 10,000 days, or roughly 27 years moving backward from the current date (Access SQL, Listing 1):
 

SELECT Now()-CLng([Table1].[Num] & [Table1_1].[Num] & [Table1_2].[Num] & [Table1_3].[Num]) AS TimeSeries
FROM Table1, Table1 AS Table1_1, Table1 AS Table1_2, Table1 AS Table1_3
ORDER BY Now()-CLng([Table1].[Num] & [Table1_1].[Num] & [Table1_2].[Num] & [Table1_3].[Num]) DESC;

 
The logic behind the solution is rather straightforward. The query creates 2 virtual tables (Table_1, Table_2 and Table_3) in addition to the 'concrete' permanent Table1, and then applies the so-called 'Cartesian product' technique, concatenating every record from all 4 tables (permanent and virtual as well). Then it applies the data type conversion to long integer, which represents the date, and finally, sorts the date series of 10,000 records, going from current date backward in descending order.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

DrABELL
President Infosoft International Inc
United States United States
Dr. A. Bell has 20+ years of Software and Electrical Engineering experience: Win/Web veteran, published 300+ articles and authored 37 inventions, credited for 10+ Enterprise level projects (>250k code lines); currently focused on .NET/WPF/C#, Javascript/jQuery, 'Big Data', AI, IoT and Mobile apps. Participated in App Innovation Contest (AIC 2102/2013) with several winning submissions. Sample projects/pubs follow:
  1. WebTV Project: Embedded YouTube Player (Goog #1 YouTube API for ASP.NET)
  2. Edumatter M12: School Math Calculators and Equation Solvers (contest winner)
  3. Engineering Calculator VOLTA-2013 (contest winner)
  4. Online 3 Fractions Calculator (#1 on Goog)
  5. Engineering Calculator VOLTA-814 for Windows
  6. Real-time NY Bus monitoring app
  7. Inflation Calculator
  8. PaydayNY-2015 Payroll Tax Calculator (Win)
  9. Multilingual Geocoder with Interactive Map
  10. Semantic Analyzer (Concordance Calculator)
  11. Prime Factoring Calculator

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Comments and Discussions

 
QuestionSQL Server Pin
Member 1041007620-Feb-15 14:33
memberMember 1041007620-Feb-15 14:33 
GeneralFYI: short URL to the full article: http://exm.nr/SQLSeq Pin
DrABELL4-Jan-11 9:36
memberDrABELL4-Jan-11 9:36 

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