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podoc:number_of_scanner_references_sql_function

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podoc:number_of_scanner_references_sql_function [2007/04/12 08:26]
Luud
podoc:number_of_scanner_references_sql_function [2007/04/23 10:31]
Luud
Line 1: Line 1:
-===== Database Function Description =====+===== Database Function Description ​of "​number_of_scanner_references" ​=====
  
 === Name === === Name ===
 +
 +number_of_scanner_references
  
 === Description === === Description ===
 +
 +Counts the number of references to a particular scanner.
 +
 +Tentative (is this correct?): this represents the number of photos in the database captured using the specified scanner.
  
 === Purpose === === Purpose ===
 +
 +To retrieve the number of references to a particular scanner.
  
 === Schema === === Schema ===
 +
 +<code sql>
 +create function number_of_scanner_references(integer) returns bigint
 +as '​select count(photo_tech.identifier)
 +      from photo_tech, scanner
 +     where photo_tech.scanner=scanner.identifier
 +       and scanner.identifier = $1' language '​sql';​
 +</​code>​
  
 === Related tables === === Related tables ===
  
-=== Related views === +  * [[photo_tech sql table|photo_tech]] 
- +  * [[scanner sql table|scanner]]
-=== Related sequences === +
- +
-=== Related indexes ===+
  
 === History === === History ===
Line 31: Line 44:
 = Version 2.5 = = Version 2.5 =
  
-  ​create function ​... +<code sql> 
-    ...   +create function ​number_of_scanner_references(integer) returns bigint 
-  );+as '​select count(photo_tech.identifier) 
 +      from photo_tech, scanner 
 +     where photo_tech.scanner=scanner.identifier 
 +       and scanner.identifier = $1' language '​sql'​; 
 +</​code>​ 
podoc/number_of_scanner_references_sql_function.txt · Last modified: 2007/04/23 10:31 by Luud