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how to create such a function?? - Mailing list pgsql-novice

From Ireneusz Kramarz
Subject how to create such a function??
Date
Msg-id 001301c3b396$6849d000$0300a8c0@iron
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Hi there,
I want to create a function and a trigger, but I don't know how...  :(
I need something that would work when I update the table 'stock' , by insert some integer value into 'sold'. Then the integer value in field 'stock' has to be decreased by that inserted value.
 
example of my problem:
 
 -table 'stock' before updating 'sold' field
 
      ticket_id | stock | sold
           1       |   30   |    0
 
 -how table 'stock' should look like after: update stock set sold=2 where bilet_id=1; 
 
     ticket_id | stock | sold
          1       |    28  |    2
 
I have to create something that would work like that, after each update of ticket_id defined rows.
 
I know that you guys can help me with that... apreciate any help which will be priceless  ;-)
 
iron

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