Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 456
  • Last Modified:

Tricky Join SQL

I've got a table of golfers that are in the 2011 US Masters.  One of the fields is qualification (how they managed to gain entrance to the tournament). I've got a table of the qualifications.  Golfers can qualify in one or more of 19 ways. So...

I need a join where all methods of qualification are returned

The tables look like this.
TblQual
QualID QualMethod
1 | Previous Winner
2 | Won British Open in last 5 years
3 | Won USOpen in last 5 years
4 | Won USPGA in last 5 years


TblPlayer
PlayerID Name Qual
1 | Lee Westwood | 1,3
2 | Ian Poulter | 2,3
3 | Martin Kaymer | 4
4 | Tiger Woods | 1,2,3,4

 
0
webdork
Asked:
webdork
  • 3
  • 2
  • 2
  • +1
2 Solutions
 
ThomasianCommented:
Here's the query for you current table structure
DECLARE @TblQual table(QualID int, QualMethod varchar(100))
INSERT @TblQual
SELECT 1, 'Previous Winner'
UNION ALL SELECT 2, 'Won British Open in last 5 years'
UNION ALL SELECT 3, 'Won USOpen in last 5 years'
UNION ALL SELECT 4, 'Won USPGA in last 5 years'

DECLARE @TblPlayer table(PlayerID int, Name varchar(100), Qual varchar(100))
INSERT @TblPlayer
SELECT 1, 'Lee Westwood', '1,3'
UNION ALL SELECT 2, 'Ian Poulter', '2,3'
UNION ALL SELECT 3, 'Martin Kaymer', '4'
UNION ALL SELECT 4, 'Tiger Woods', '1,2,3,4'

SELECT *
FROM @TblPlayer P LEFT JOIN
     @TblQual Q ON ',' + P.Qual + ',' LIKE '%,' + CAST(Q.QualID as varchar) + ',%'

Open in new window



But I suggest that you add another table TblPlayerQual to join the 2 table.
DECLARE @TblQual table(QualID int, QualMethod varchar(100))
INSERT @TblQual
SELECT 1, 'Previous Winner'
UNION ALL SELECT 2, 'Won British Open in last 5 years'
UNION ALL SELECT 3, 'Won USOpen in last 5 years'
UNION ALL SELECT 4, 'Won USPGA in last 5 years'

DECLARE @TblPlayer table(PlayerID int, Name varchar(100))
INSERT @TblPlayer
SELECT 1, 'Lee Westwood'
UNION ALL SELECT 2, 'Ian Poulter'
UNION ALL SELECT 3, 'Martin Kaymer'
UNION ALL SELECT 4, 'Tiger Woods'

DECLARE @TblPlayerQual table(PlayerID int, QualID int)
INSERT @TblPlayerQual
SELECT 1,1
UNION ALL SELECT 1,2
UNION ALL SELECT 2,2
UNION ALL SELECT 3,3
UNION ALL SELECT 4,1
UNION ALL SELECT 4,2
UNION ALL SELECT 4,3
UNION ALL SELECT 4,4

SELECT *
FROM @TblPlayer P LEFT JOIN
     @TblPlayerQual PQ ON P.PlayerID=PQ.PlayerID LEFT JOIN
     @TblQual Q ON Q.QualID=PQ.QualID

Open in new window

0
 
SharathData EngineerCommented:
Not sure about your final result, but you can try like this to join both the tables.
select * 
  from (
SELECT PlayerID,Name,ltrim(SUBSTRING(Qual, n, CHARINDEX(',', Qual + ',',n) - n)) AS QualID
 FROM @TblPlayer
CROSS JOIN (SELECT number FROM master..spt_values WHERE type = 'P')  AS Numbers(n)
WHERE SUBSTRING(',' + Qual, n, 1) = ','
  AND n < LEN(Qual) + 1) t1
 join @TblQual t2 on t1.QualID = t2.QualID
order by t1.PlayerID

Open in new window


Check the result with your sample data.
declare @TblQual table(QualID int,QualMethod varchar(40))
insert @TblQual values (1,'Previous Winner')
insert @TblQual values (2 , 'Won British Open in last 5 years')
insert @TblQual values (3 , 'Won USOpen in last 5 years')
insert @TblQual values (4 , 'Won USPGA in last 5 years')


declare @TblPlayer table(PlayerID int,Name varchar(20),Qual varchar(20))
insert @TblPlayer values (1 , 'Lee Westwood' , '1,3')
insert @TblPlayer values (2 , 'Ian Poulter' , '2,3')
insert @TblPlayer values (3 , 'Martin Kaymer' , '4')
insert @TblPlayer values (4 , 'Tiger Woods' , '1,2,3,4')

select * 
  from (
SELECT PlayerID,Name,ltrim(SUBSTRING(Qual, n, CHARINDEX(',', Qual + ',',n) - n)) AS QualID
 FROM @TblPlayer
CROSS JOIN (SELECT number FROM master..spt_values WHERE type = 'P')  AS Numbers(n)
WHERE SUBSTRING(',' + Qual, n, 1) = ','
  AND n < LEN(Qual) + 1) t1
 join @TblQual t2 on t1.QualID = t2.QualID
order by t1.PlayerID
/*
PlayerID	Name	QualID	QualID	QualMethod
1	Lee Westwood	1	1	Previous Winner
1	Lee Westwood	3	3	Won USOpen in last 5 years
2	Ian Poulter	2	2	Won British Open in last 5 years
2	Ian Poulter	3	3	Won USOpen in last 5 years
3	Martin Kaymer	4	4	Won USPGA in last 5 years
4	Tiger Woods	1	1	Previous Winner
4	Tiger Woods	2	2	Won British Open in last 5 years
4	Tiger Woods	3	3	Won USOpen in last 5 years
4	Tiger Woods	4	4	Won USPGA in last 5 years
*/

Open in new window

0
 
Abiel de GrootCommented:
I also think that there should be a thrid table which records the wins 'qual' with the players. the table could be as simple as this;

RecID - int (primary field)
PlayerId - int
Qual - tinyint

Each player could have either no entry or multiple entries.

This makes viewing and working with results very easy indeed.


Hope this helps.

A.
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
Abiel de GrootCommented:
@Thomasian

I like your idea... quite complex, but complete.
0
 
webdorkAuthor Commented:
I'm not really understanding... When I try the queries above I'm getting an error.

Syntax error converting the nvarchar value '6-B' to a column of data type int.

The column Qual in the Players Table is nvarchar because some of the qualifier codes are alpha and numeric like 6-B.

I thought it would be simpler and use the IN operator.

The results I'm looking for would be like this:

Select * from NewView where PlayerId = 4

Results:
Tiger Woods | (1) Former Masters Champion, (2) Winner of the Open Championship in the last 5 years, (r)  Winner of the US Open in the last 5 years.

etc..



0
 
SharathData EngineerCommented:
>> I'm not really understanding... When I try the queries above I'm getting an error.
Which query are you referring?
>> The column Qual in the Players Table is nvarchar because some of the qualifier codes are alpha and numeric like 6-B.
I assumed that you have qualifiers separated by comma. Is that nit correct?
0
 
webdorkAuthor Commented:
Yes quals separated by Comma. Query below.


select *
  from (
SELECT PlayerID,Name,ltrim(SUBSTRING(Qual, n, CHARINDEX(',', Qual + ',',n) - n)) AS QualID
 FROM @TblPlayer
CROSS JOIN (SELECT number FROM master..spt_values WHERE type = 'P')  AS Numbers(n)
WHERE SUBSTRING(',' + Qual, n, 1) = ','
  AND n < LEN(Qual) + 1) t1
 join @TblQual t2 on t1.QualID = t2.QualID
order by t1.PlayerID
0
 
ThomasianCommented:
webdork,

Have you tried my suggestions in http:#a34868246 ?

If so, are you having the same error?
0
 
SharathData EngineerCommented:
The what error are you getting? I have tested this for your sample data.
0

Featured Post

Hire Technology Freelancers with Gigs

Work with freelancers specializing in everything from database administration to programming, who have proven themselves as experts in their field. Hire the best, collaborate easily, pay securely, and get projects done right.

  • 3
  • 2
  • 2
  • +1
Tackle projects and never again get stuck behind a technical roadblock.
Join Now