We help IT Professionals succeed at work.
Get Started

Can you do an "intra-table join"?

SiobhanElara
SiobhanElara asked
on
289 Views
Last Modified: 2013-06-20
I've inherited a table that contains a list of products. For the sake of simplicity, we'll say the columns are as follows:

ID (the auto-incremented value)
name
description
size
subsetOf
price

The field subsetOf can either be a number that is 0, meaning it's a "base" product, or some other integer, referring to another ID. If it's not 0, it contains a different size and price from the base product with a blank name and description (since those fields should be the same as the base.)

If this were in two separate tables, you could obviously do a join on subsetOf = ID and not have the name or description fields in the second table at all. As it stands, if I do a query for a couple of IDs I may wind up with the following:

ID   name          description             size   subsetOf   price
3    green shirt   a nifty green shirt     L      0          5.00
4                                          XL     3          9.00

Open in new window


Is there a way within the query to get instead:
ID   name          description             size   subsetOf   price
3    green shirt   a nifty green shirt     L      0          5.00
4    green shirt   a nifty green shirt     XL     3          9.00

Open in new window


Thanks!
Comment
Watch Question
Most Valuable Expert 2011
Author of the Year 2014
Commented:
This problem has been solved!
Unlock 2 Answers and 4 Comments.
See Answers
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE