[support] Doubt on Index and Primary key

[Pat Johnston]

Austin,

I think you're off to a good start. I might suggest that you do 
something about all of those skill-set tables. You could replace them 
with three tables and still have the information in easy reach:

- A skillGroup table with
-- sgID - an integer primary key
-- name - name of the group, like 'Web Skills', 'Database'

- A skills table with
-- sID - an integer primary key
-- sgID - ID of the skillGroup that the skill belongs to
-- skill - the name of the skill, like 'PHP' or 'PostgreSql'

- A skillset table with
-- UID - your user ID
-- sID - ID of the skill being rated
-- skillRating - 0 or 1 or whatever

The skillset entry links to the skill via the sID and to the user table 
(Table 1) with the UID. The skill table is then linked to the skillGroup 
via the sgID. This way you can add skill groups and skills as need 
without needing to create more tables.

Good Luck,

Pat

On 3/24/2011 6:58 PM, Austin Einter wrote:
> Hi Pierre, David, Ursula
> Thanks for excellent piece of information. I just went through basic 
> database concepts like indexing, join, normalisation and tried to 
> analyse how can I apply these for my job registration site implementation.
> After understanding a bit on normalisation and join, I have comeup 
> with below approach for this specific case.
> Instead of having a single table, and comma separated values in table 
> cells , I am going to split it multiple tables.
> I am attaching a table.xls file , please have a look.
> In that excel sheet, I have the main table, and I have broken the main 
> table into 9 different tables. But I hope it need to be broken 
> into more number of tables, depends on how many  different kind of 
> work domains are there. It may go to 50+ tables.
> Examples for work domains are - Web, PSTN, VoIP, NetworkManagement, 
> GSM, Datbase, BoardDesign etc.
> So how many work domains are there, those many tables will be there. 
> In those tables, a coulmn will represent a particular skill set.
> Say under Web Tables, coulmns can be HTML, PHP, Web2.0, Drupal, ASP, etc
> And under NetworkManagement table, NMS and SNMP can be coulmns.
> In table cells, I will keep either 1 or 0, depending on the person has 
> that skill or not.
>  Example: Lets say User 2 knows NMS and SNMP, User 3 knows only SNMP, 
> User4 knows only SNMP, then the table will look as below.
> *UID* 	NMS 	SNMP
> 2 	1 	1
> 3 	0 	1
> 4 	0 	1
>
> As first time I am  doing this, I might be wrong. If so, kindly let me 
> know.
> Best Regards
> Austin.
>
>
> On Fri, Mar 18, 2011 at 8:54 PM, Pierre Rineau 
> <pierre.rineau at makina-corpus.com 
> <mailto:pierre.rineau at makina-corpus.com>> wrote:
>
>     Le vendredi 18 mars 2011 à 08:15 -0700, Metzler, David a écrit :
>     > Pierre is spot on here.
>     >
>     > That is why most dbas would advise against storing this data in
>     a comma separated list in a single field.  An index cannot really
>     be used to search within the text cause you are forcing to examine
>     every row anyway.  I can't programtically say lets start with the
>     N's, now is there a nokia in there (that's an oversimplification
>     intentionally to make a point). Rather I would make a single skill
>     table that housed the values. If UID is the primary key for the
>     resume, then you'd make a table with
>     >
>     > On a separate note, you do understand that the site that you're
>     talking about building could be done without you writing ANY code?
>     Basically the site you've described can be implemented with
>     content_profile, cck and views modules, allowing you to build
>     custom content types that are tied (one per user).  You could then
>     use taxonomys for skill sets an all this would be written for you?
>     >
>     > Dave
>
>     Dave is right about the fact this simple business stuff could be
>     done in
>     many ways using D6 existing modules (even only with core and taxonomy)
>     or D7 fields.
>
>     But, if you really want to learn technical aspects of SQL and/or
>     Drupal
>     development, this is a good thing to start with this kind of simple
>     business stuff.
>
>     Pierre.
>
>
>     --
>     [ Drupal support list | http://lists.drupal.org/ ]
>
>

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