Select query in SQL (how to)

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I have 2 tables:

Table 1: Attributes
contents are 2 fields
attrID ; attribute
DV ; Diver
CL ; Climber
FF ; Fire Fighter

Table 2: userAttributes
contents are 2 fields
attrFK ; username
CL ; Peter
FF ; Peter
CL ; Joe

Then I have to dropdown lists in html and php, I need a select query so that when I click on one dropdown which holds the usenames and select it, the other dropdown list will show only those missing attributes of the users

Can any one help me?

Thanks

Posted 9-May-13 8:23am

datt265

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Maciej Los · Accepted Answer · 2013-05-09T08:36:00

Solution 2

Try this:
SQL

SELECT t1.username, t2.attribute FROM userAttributes AS t1 INNER JOIN Attributes AS t2 ON t1.attrFK = t2.attrID WHERE t1.username = @username

[EDIT #1 - missing attributes]

SQL

SELECT attribute AS MissingAttribute
FROM Attributes 
WHERE attrID NOT IN (
    SELECT t2.attrFK AS AttrID
    FROM userAttributes AS t1 INNER JOIN Attributes AS t2 ON t1.attrFK = t2.attrID
    WHERE t1.username = @username)

[EDIT]

More: IN (T-SQL)[^]

Posted 9-May-13 8:36am

Maciej Los

Updated 9-May-13 8:55am

v3

Comments

datt265 9-May-13 14:45pm

Thanks for your reply, with this I can get the attributes that the user already has, I want the inverse, that is the attributes missing to the user so that when I select the dropdown list I can add them to the user attributes

Maciej Los 9-May-13 14:48pm

OK, sorry, my mistake. I'll improve my answer ASAP.

datt265 9-May-13 15:09pm

I am getting
Unknown column 't2.attrFK' in 'field list'

Maciej Los 9-May-13 15:11pm

Replace t2.attrFK with t1.attrFK.

datt265 9-May-13 15:21pm

ok now thanks alot

Maciej Los 9-May-13 15:48pm

You're welcome ;)