The Best Method Of Storing Multiple Values For A Single User Criteria In The Database ?

Mar 31, 2008

Let's say you had a User table and one of the fields was called Deceased.  It's a simple closed-ended question, so a bit value could be used to satisfy the field, if the person is dead or alive.  Let's say another field is called EyeColor.  A person can have only one eye color and thus one answer should be stored in this value, so this is easy as well.

Now, let's say I want to store all the languages that a specific user can speak.  This isn't as easy as the previous examples since it's not a yes or no or a single-value answer.  I haven't had much experience with working with databases so I've come up with two possible ways with my crude knowledge hehe.

In terms of inputting the multi-answer values, I suppose I could use a multiple-selection listbox, cascading dropdowns, etc.  Now, here are the 2 solutions that came to mind.....

1) Make a field called LanguagesSpoken in the User table.  When I process the selections the user makes on the languages he knows, I can then insert into the LanguagesSpoken field a string "English, Spanish, Czech" or IDs corresponding to the languages like "1, 5, 12" (these IDs would be referenced from a separate table I guess).  I would use commas so that later on, when I need to display a user's profile and show the user's languages, I can retrieve that long string from the LanguagesSpoken field, and parse the languages with the commas I've used.  Using commas would just be a convention I use so I would know how to parse (I could have used "." or "|" or anything else I guess) the data.

2) Forget about the LanguagesSpoken field in the User table altogether, and just make a LanguagesSpoken table.  A simple implementation would have 3 fields (primary key, userId, languageId).  A row would associate a user with a language.  So I would issue a query like "SELECT * FROM LanguagesSpoken WHERE userId=5" (where userId=5 is some user).  Using this method would free me from having to store a string with delimited values into the User table and then to parse data when I need them.  However, I'm not sure how efficient this method would be if the LanguagesSpoken table grows really large since the userIds would NOT be contiguous, the search might take a long time.  I guess I would index the userId field in the LanguagesSpoken table for quicker access?

OR, I may be going about this the wrong way and I'm way out on left field with these 2 solutions.  Is there a better way other than those 2 methods?

I haven't work extensively with databases and I'm just familiar with the basics.  I'm just trying to find out the best-practice implementation for this type of situation.  I'm sure in the real world, situations like this is very common and I wonder how the professionals code this.

Thanks in advance.

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Hi,

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[1] Database BV Produktion: Check Data and Index Linkage...

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