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[MYSQL-PHP] Organize ID-s

 
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scearezt
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PostPosted: Sat Apr 02, 2011 3:51 am    Post subject: [MYSQL-PHP] Organize ID-s Reply with quote
Is it possible to organize the ID-s in a specific table?

e.g.:
Code:
ID     NAME     ADDRESS
1       John      Saint Marie st.
2       Julie      Baha st.
3       Adam    Heir st.
4       Joe        Saint Cleveland st.


So I'll delete the ID 3 with a form and PHP and this happens:

Code:
ID     NAME     ADDRESS
1       John      Saint Marie st.
2       Julie      Baha st.
4       Joe        Saint Cleveland st.


That's right but I want to organize the IDs, so this should happen:

Code:
ID     NAME     ADDRESS
1       John      Saint Marie st.
2       Julie      Baha st.
3       Joe        Saint Cleveland st.


Idea how to do it?
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atom0s
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PostPosted: Sat Apr 02, 2011 9:13 am    Post subject: Reply with quote
Simply put; don't. Your ID field is being used as a primary key making it 'unique' to whoever owned it. Meaning after it has been used one, it cannot be used again.

Think of it like this, lets say we have your first table:
Code:
ID     NAME     ADDRESS
1       John      Saint Marie st.
2       Julie      Baha st.
3       Adam    Heir st.
4       Joe        Saint Cleveland st.


And lets say this is a shopping cart site or something where people can buy things. Lets say Adam has ordered 4 things online but for some reason you feel the need to delete his account before his order finishes. Now you have:
Code:
ID     NAME     ADDRESS
1       John      Saint Marie st.
2       Julie      Baha st.
3       Joe        Saint Cleveland st.


Which at this point now Joe has Adam's shipment information, order information, and access to any and all of Adams old orders, data, and personal information.

The point of primary keys is for security as well as unique ids. Don't use the ID if you need any specific data other then a unique identifier. If you want a count of the users just use COUNT(*) in your queries instead.
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