Question

Need some help with a question about triggers

Asked by: errang

Hey,

       I'm working on a question, and I got an answer, but I have no way of finding out if I'm right or wrong... so I was hoping I could get some help to figure that out:

This is the question:

Product(maker, model, type)
Printer(model, color, type, price)

When inserting a new printer, check that the model number exists in Product.

This is what I got:

CREATE TRIGGER trigg_B
   BEFORE INSERT ON Printer
      FOR EACH ROW
      IF primary_key = NEW.primary_key
      AND (NOT EXISTS NEW.model)
            INSERT INTO Product null, NEW.model, NEW.type
   END;

I'm writing this in MySQL, I'm new to it, so I might have made some slight syntax errors, and I apologize for that, but do I have the right idea?

Thanks in advance!

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Asked On
2009-11-03 at 10:32:27ID24868195
Tags

trigger

,

MySQL

Topics

MySQL Server

,

MS SQL Server

,

Databases Miscellaneous

Participating Experts
1
Points
500
Comments
2

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Answers

 

by: angelIIIPosted on 2009-11-03 at 11:59:43ID: 25732899

something along these lines should compile and run better:

CREATE TRIGGER trigg_B
BEFORE INSERT ON Printer
FOR EACH ROW
BEGIN
  IF NOT EXISTS( SELECT NULL FROM product WHERE model = NEW.Model ) THEN
    INSERT INTO Product (model, type) VALUES (NEW.model, NEW.type);
  END IF;
END;

                                              
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by: errangPosted on 2009-11-03 at 12:42:49ID: 25733376

sweet, thanks a lot.

20120131-EE-VQP-002

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