Solved

SQL and Distinct

Posted on 2009-05-06
8
235 Views
Last Modified: 2012-05-06
I'm having a problem selecting using distinct and then doing a join. I am trying to just select one vehicle of a specific trim level if more than one exist but I do still  need all the other data from the two tables.

I know the below code is wrong but I'm just learning this stuff and would greatly appreciate your assistance.
Thanks!  
$query_CRV = "SELECT *, DISTINCT Vehicle_Additional_Information.Trim " .

"FROM ebizcardata " .

"INNER JOIN Vehicle_Additional_Information " .

"ON ebizcardata.Stock_No = Vehicle_Additional_Information.Stock_No " 

"WHERE Modell = 'Accord' AND New_Used = 'New' AND Ext_Color = 'Taffeta White' 

OR Modell ='Accord' AND New_Used = 'New' AND Ext_Color = 'White Diamond Pearl'" .  

"ORDER BY Year ASC,  STR_TO_DATE(Date_In_Stock, '%m/%d/%Y') ASC";

Open in new window

0
Comment
Question by:Cutthroat_Trout
8 Comments
 
LVL 13

Expert Comment

by:usachrisk1983
ID: 24321224
Distinct applies to an entire query, and not just one field.  So, you'd want to use the following to select distinct.  I also added some parens in your where clause, otherwise your or statements will just "take over" and your other statements wont really matter :)

Also, DISTINCT is sometimes "costly", you might want to look into using GROUP BY instead when possible.

select distinct vehicle_additional_information.trim

  from ebizcardata

 inner join vehicle_additional_information

    on ebizcardata.Stock_No = Vehicle_Additional_Information.Stock_No

 where (Modell = 'Accord' 

   and New_Used = 'New' 

   and Ext_Color = 'Taffeta White')

    or (Modell ='Accord'

   AND New_Used = 'New' 

   AND Ext_Color = 'White Diamond Pearl')

 ORDER BY Year ASC,  STR_TO_DATE(Date_In_Stock, '%m/%d/%Y') ASC

Open in new window

0
 
LVL 57

Accepted Solution

by:
Raja Jegan R earned 500 total points
ID: 24321252
Slightly tuned out the query too.

Distinct is not required as we are doing an inner join on that table. And if you have duplicate records in the below SELECT query then use

SELECT distinct ebizcardata.*,

instead of

SELECT ebizcardata.*,
SELECT ebizcardata.*, Vehicle_Additional_Information.Trim 

FROM ebizcardata 

INNER JOIN Vehicle_Additional_Information 

ON ebizcardata.Stock_No = Vehicle_Additional_Information.Stock_No 

WHERE Modell = 'Accord' AND New_Used = 'New' 

AND Ext_Color IN ('White Diamond Pearl','Taffeta White')

ORDER BY Year ASC,  STR_TO_DATE(Date_In_Stock, '%m/%d/%Y') ASC

Open in new window

0
 

Author Comment

by:Cutthroat_Trout
ID: 24321355
Am I not asking the question right? Both of your examples work (well kind of) but not still do not give me what I am looking for. I need all the data from both the tables (I use it later in the code) but I do not want to show the duplicated trim column results.  

Thanks again for the help.
0
 
LVL 26

Expert Comment

by:Chris Luttrell
ID: 24322820
I believe what you want is the TOP opeerator not Distinct.  The first query below will give you just the first row that match your criteria, but all columns from both tables.
If it is that you only want the top 1 row from the Vehicle_Additional_Information table and all the values from the other table, ebizcardata, then you will have to the query something like the second example where you make the Vehicle_Additional_Information into a subselect that uses TOP 1 to get the first record from there and match it to the other table.
$query_CRV = "SELECT TOP 1 * " .

"FROM ebizcardata " .

"INNER JOIN Vehicle_Additional_Information " .

"ON ebizcardata.Stock_No = Vehicle_Additional_Information.Stock_No " 

"WHERE Modell = 'Accord' AND New_Used = 'New' AND Ext_Color = 'Taffeta White' 

OR Modell ='Accord' AND New_Used = 'New' AND Ext_Color = 'White Diamond Pearl'" .  

"ORDER BY Year ASC,  STR_TO_DATE(Date_In_Stock, '%m/%d/%Y') ASC";
 

$query_CRV = "SELECT * " .

"FROM ebizcardata " .

"INNER JOIN (SELECT TOP 1 * FROM Vehicle_Additional_Information ".

"    WHERE conditions_that_limit_this_table=values) Vehicle_Additional_Information " .

"ON ebizcardata.Stock_No = Vehicle_Additional_Information.Stock_No " 

"WHERE Modell = 'Accord' AND New_Used = 'New' AND Ext_Color = 'Taffeta White' 

OR Modell ='Accord' AND New_Used = 'New' AND Ext_Color = 'White Diamond Pearl'" .  

"ORDER BY Year ASC,  STR_TO_DATE(Date_In_Stock, '%m/%d/%Y') ASC";

Open in new window

0
DevOps Toolchain Recommendations

Read this Gartner Research Note and discover how your IT organization can automate and optimize DevOps processes using a toolchain architecture.

 
LVL 40

Expert Comment

by:Sharath
ID: 24322845
i think you need this.
SELECT e.*, v1.Trim 

  FROM ebizcardata e

 INNER JOIN Vehicle_Additional_Information v1 

    ON e.Stock_No = v1.Stock_No 

 INNER JOIN (SELECT Stock_No,MAX(Trim) AS Trim FROM Vehicle_Additional_Information GROUP BY Stock_No) AS v2

    ON v1.Stock_No = v2.Stock_No AND v1.Trim = v2.Trim

 WHERE Modell = 'Accord' AND New_Used = 'New' 

   AND Ext_Color IN ('White Diamond Pearl','Taffeta White')

 ORDER BY Year ASC,  STR_TO_DATE(Date_In_Stock, '%m/%d/%Y') ASC

Open in new window

0
 

Author Comment

by:Cutthroat_Trout
ID: 24328233
Well thanks for your efforts. It still does not do what I was attempting to do but I did learn some ways to clean up the initial statement.  So I'll close this question.

The problem still exist. Duplicate trims are returned.

Thanks any way.
0
 

Author Closing Comment

by:Cutthroat_Trout
ID: 31578791
I can't figure out how to split up the points and you IN clause was the most helpful tip I learned by asking this question even though my original problem still exists.
0
 
LVL 40

Expert Comment

by:Sharath
ID: 24331628
If you still need assistance, post the result of my query and your expected result.
0

Featured Post

3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

A recent questions about how to add SSRS named instances, couldn't find any that talks about SQL server 2008, anyway I decided to help by creating some screen shots. The installation is straightforward, you just pop the SQL server 2008 installati…
Composite queries are used to retrieve the results from joining multiple queries after applying any filters. UNION, INTERSECT, MINUS, and UNION ALL are some of the operators used to get certain desired results.​
Along with being a a promotional video for my three-day Annielytics Dashboard Seminor, this Micro Tutorial is an intro to Google Analytics API data.
This is used to tweak the memory usage for your computer, it is used for servers more so than workstations but just be careful editing registry settings as it may cause irreversible results. I hold no responsibility for anything you do to the regist…

895 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

15 Experts available now in Live!

Get 1:1 Help Now