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podoc:number_of_camera_references_sql_function

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podoc:number_of_camera_references_sql_function [2007/04/12 12:26] Luudpodoc:number_of_camera_references_sql_function [2007/04/23 14:30] (current) Luud
Line 1: Line 1:
-===== Database Function Description =====+===== Database Function Description of "number_of_camera_references" =====
  
 === Name === === Name ===
 +
 +number_of_camera_references
  
 === Description === === Description ===
 +
 +Counts the number of references for a specific camera.
 +
 +// Tentative (is this correct?): // this represents the number of photos in the database generated by the specified camera.
  
 === Purpose === === Purpose ===
 +
 +To retrieve the number of references to a particular camera.
  
 === Schema === === Schema ===
 +
 +<code sql>
 +create function number_of_camera_references(integer) returns bigint
 +as 'select count(photo_tech.identifier)
 +      from photo_tech, camera
 +     where photo_tech.camera=camera.identifier
 +       and camera.identifier = $1' language 'sql';
 +</code>
  
 === Related tables === === Related tables ===
  
-=== Related views === +  * [[camera sql table|camera]] 
- +  * [[photo_tech sql table|photo_tech]]
-=== Related sequences === +
- +
-=== Related indexes ===+
  
 === History === === History ===
Line 31: Line 44:
 = Version 2.5 = = Version 2.5 =
  
-  create function ... +<code sql> 
-    ...   +create function number_of_camera_references(integer) returns bigint 
-  );+as 'select count(photo_tech.identifier) 
 +      from photo_tech, camera 
 +     where photo_tech.camera=camera.identifier 
 +       and camera.identifier = $1' language 'sql'; 
 +</code> 
podoc/number_of_camera_references_sql_function.txt · Last modified: 2007/04/23 14:30 by Luud