How can I include missing records of two tables

Dear Experts-Exchange:

I have the following two tables:

Table #1: CUSTOMER_POSIZES
Columns: COMPANY_ID,CUSTOMER_ID,CUSTOMERSTYLE_ID,CUSTOMERPO_ID,CUSTOMERSIZE_ID
Row #1: 0,8,'GARMENT #3',2,'6'
Row #2: 0,8,'GARMENT #3',2,'XS'
Row #3: 0,8,'GARMENT #3',2,'S'
Row #4: 0,8,'GARMENT #3',2,'M'

and

Table #2: CUSTOMER_SIZESPSTYLE
Columns: COMPANY_ID,CUSTOMER_ID,CUSTOMERSTYLE_ID,CUSTOMERSIZE_ID
Row #1: 0,8,'GARMENT #3','XS'
Row #2: 0,8,'GARMENT #3','S'
Row #3: 0,8,'GARMENT #3','M'
Row #4: 0,8,'GARMENT #3','L'

Notice that CUSTOMERSIZE_ID = '6' is not present in CUSTOMER_SIZESPSTYLE list.

I need to write an SQL SELECT that can give me the following result set:

Row #1: '6'
Row #2: 'XS'
Row #3: 'S'
Row #4: 'M'
Row #5: 'L'

I will appreciate your help.

Best regards,

Conrado
Conrado ZAVALAAsked:
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Neil RussellTechnical Development LeadCommented:
Please define WHY you expect that output? You dont explain why you want the output specified. It displays 5 rows, what are the 5 rows?

You need to explain the logic behind WHY you expect to get that output. We could guess but then you may end up with a statement that works on THAT set of data but not on others.
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SimonCommented:
This statement will give you the combined list of unique values

select DISTINCT CUSTOMERSIZE_ID from CUSTOMER_POSIZES
UNION
select DISTINCT CUSTOMERSIZE_ID from CUSTOMER_SIZESPSTYLE

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The union statement will omit duplicates.

What the above won't do is give the sort order that you want. You'd need another table such as
create table SIZE_LIST (
CUSTOMERSIZE_ID, SORTORDER)
Insert into Size_LIST
Values ('6',10),
('XS',20),
('S',30),
('M',40)
( 'L',50)

You could then select the sort order value from that table

select DISTINCT SORTORDER,CUSTOMERSIZE_ID from CUSTOMER_POSIZES  C inner join SIZE_LIST S on C.CUSTOMERSIZE_ID =S.CUSTOMERSIZE_ID
UNION
select SORTORDER,DISTINCT CUSTOMERSIZE_ID from CUSTOMER_SIZESPSTYLE  C inner join SIZE_LIST S on C.CUSTOMERSIZE_ID =S.CUSTOMERSIZE_ID
Order By SortOrder

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Ludo Van den Boschict-managerCommented:
I don't agree with you. Your result would give:

Row #1: '6'
Row #2: 'XS'
Row #3: 'S'
Row #4: ,'M'
Row #5: 'XS'
Row #6: 'S'
Row #7: 'M'
Row #8: 'L'

because you first do a distinct on the seperate tables and then you union them together.

I think the following query is the correct one:

select distinct CUSTOMERSIZE_ID from (
select CUSTOMERSIZE_ID from CUSTOMER_POSIZES
union
select CUSTOMERSIZE_ID from CUSTOMER_SIZESPSTYLE
)

I first union them and then distinct the selection
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SimonCommented:
@Ludo - UNION removes duplicates, UNION ALL does not. That's why I used the former.
UNION (Transact-SQL)
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Conrado ZAVALAAuthor Commented:
Thank you SimonAdept for providing a solution to my case.  With your recommendation, I ended up building the following SQL SELECT:

SELECT B.SORT_ORDER, A.CUSTOMERSIZE_ID, C.QUANTITY, C.QUANTITYALLOW FROM CUSTOMER_SIZESPSTYLE A
INNER JOIN CUSTOMER_SIZES B ON A.COMPANY_ID = B.COMPANY_ID AND A.CUSTOMER_ID = B.CUSTOMER_ID AND A.CUSTOMERSIZE_ID = B.CUSTOMERSIZE_ID
LEFT JOIN CUSTOMER_POSIZES C ON A.COMPANY_ID = C.COMPANY_ID AND A.CUSTOMER_ID = C.CUSTOMER_ID AND A.CUSTOMERSTYLE_ID = C.CUSTOMERSTYLE_ID AND A.CUSTOMERSIZE_ID = C.CUSTOMERSIZE_ID
WHERE
      A.COMPANY_ID = 0 AND
      A.CUSTOMER_ID = 8 AND
      A.CUSTOMERSTYLE_ID = 'GARMENT #3'
UNION
SELECT B.SORT_ORDER, A.CUSTOMERSIZE_ID, A.QUANTITY, A.QUANTITYALLOW FROM CUSTOMER_POSIZES A
INNER JOIN CUSTOMER_SIZES B ON A.COMPANY_ID = B.COMPANY_ID AND A.CUSTOMER_ID = B.CUSTOMER_ID AND A.CUSTOMERSIZE_ID = B.CUSTOMERSIZE_ID
WHERE
      A.COMPANY_ID = 0 AND
      A.CUSTOMER_ID = 8 AND
      A.CUSTOMERPO_ID = 2 AND
      A.CUSTOMERSTYLE_ID = 'GARMENT #3' AND
      A.COLOR_ID = 'CARD. RED'
ORDER BY SORT_ORDER

Now, I am getting the output I need in my program :)

I also want to thank Neilsr and Ludo Van den Bosch for getting involved in this case.  I highly appreciate everyone's help.

Thank you all,

Conrado
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