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Posted by David Haynes on 06/13/87 11:38
johnny wrote:
> hi all,
>
> I hope it is easier for you to answer than for me trying to explain
> it...
>
> In a database I have some tables , each one has some mandatory fields
> at the beginning and a couple at the end.
> In the middle each table can have some additional fields from 0 to n
> depending on how many fields have been inserted by who created the
> table.
>
> Now, I need to set up a script which ,after receiving from a form the
> table name, can print the first known fields,and all the additional
> ones , but I don' t want it to show the last 2 columns of the table
> because they store sensitive or useless contents.
>
>
> any tips ?
>
> TIA
>
> johnny
>
Sounds like you have a database design problem more than a query
problem. With the limited details you have provided, I would suggest
something like the following:
1. have a table that contains the mandatory fields and the private ones.
Let's call this one table 'A'.
2. make sure that each row in the table has a unique id (in mysql, look
at the auto_increment feature)
3. create a second table, 'B', that will contain the arbitrary data.
Each row in B will contain the argument value and the id from the row in
table A that is relates to. So, you have 0 to n rows in B referencing
the unique id of a row in A.
This lets you have an arbitrary number of fields in B for each entry in
A. Also, if you name the columns in A in your SQL query instead of
using '*', you can have SQL ignore the private fields on the end.
If this helps, I would suggest you spend a little time looking at
database design and the capabilities of the SQL language.
-david-
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