Companies in Different Tables - Microsoft Access Expert 2


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Companies in Different Tables

Abdulhadi Qasem

3 years ago

hi thank you very much for your classes i am enjoying a lot, just now reviewed lesson 4 ( Value Across Forms )

small question what if i have 3 different tables for companies for example, table for hotels , table for airlines, table for not either hotels or airlines - e.g.company to supply the bus.

based on this lesson to supply the company id, i should do 3 lists ( hotels, etc ) to open their form then a button to open orders or contacts and to supply the company id .

is there a better way? maybe through VBA i can make combo box that i chose first is it hotels or airlines etc then to choose one based on the previous combo box.

	Kevin Robertson 3 years ago
Cascading Combo Boxes

Scott Axton

3 years ago

The better way is  to have only 1 table for the companies.  Then make a second table to assign the business category type (Hotel, Restaurant, Airline, etc.)
BUT what happens if a company can do multiple things?  Hotel and Restaurant for instance.
Then you would need a 3rd "junction" table.
The best way is to keep going in your courses in order.  You will learn as you go the better methods.

If you want to jump ahead:
Normalizing Data
Relationships
Many-to-Many

Abdulhadi Qasem OP

3 years ago

hi Scott and Kevin thank you for your reply

i cant store them in one table as hotel table is linked with a table showing booking details like check in date, number of rooms booked etc.

and the airline (company name) table is linked with some tables showing the details of the flight etc

the third table is to to store companies that offer buses services, hotels (sometimes we book hotels from local agency) so as you said the third table i can add category type (bus company, Local Agency Travel etc)

thats why i need 3 tables to store my suppliers. i have companyID attribute that is coming from three different tables.

i am modelling accounting system for travel agency that is offering Groups Travels .

	Richard Rost 3 years ago
I would still use one table for all of the different companies, and then if you need separate data for each, make related 1-to-1 tables for them. Your main CompanyT would have the fields that are common to all of them (name, address, phone, etc.) and then for the airlines you could have a related AirlineInfoT that had info specific to just airlines. But that's just my advice.

	Abdulhadi Qasem OP 3 years ago
wooow another solution from different angle . i will wait as you said don't jump into your project until later stage. thank you very much. God Bless You

	Richard Rost 3 years ago
I've actually got a TechHelp video on this coming out soon... look for it. Someone else asked me a very similar question.

	Richard Rost 3 years ago
Abdulhadi, here's the video: Too Many Tables. It's literally the same thing that Scott said to do, above. :)

	Abdulhadi Qasem OP 3 years ago
yes i saw it in youtube, thank you very much. i will wait i will not do anything in my project.

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