number_of_lens_references

Counts the number of references to a particular lens.

Tentative (is this correct?): this represents the number of photos in the database captured using the specified lens.

To retrieve the number of references to a particular lens.

CREATE FUNCTION number_of_lens_references(integer) returns bigint
AS 'select count(photo_tech.identifier)
      from photo_tech, lens
     where photo_tech.lens=lens.identifier
       and lens.identifier = $1' LANGUAGE 'sql';

• lens
• photo_tech

Version 2.5

Still in use

= Version 2.5 =

CREATE FUNCTION number_of_lens_references(integer) returns bigint
AS 'select count(photo_tech.identifier)
      from photo_tech, lens
     where photo_tech.lens=lens.identifier
       and lens.identifier = $1' LANGUAGE 'sql';