Question

I am building upon a SQl statement from the following post: Union two different tables with a primary ID field

There are two tables (md_master & cd_personal_checks) that I am trying to union into one view.
Here is my current statement.

CREATE VIEW ViewCR AS  

SELECT id  + 100000000000000000 AS id, a.external_code + CAST(id AS varchar(15)) as crUniqueId,
       m.check_amount, 'C' as crType, m.postprint_date as activationDate,
       m.postprint_date as creationDate, m.memo_explanation as reasonLine1, m.check_no
  FROM MD_Master m
  Join accounts a on m.account_tag = a.acct_id
 WHERE (m.postprint_tag = 2) OR (m.postprint_tag = 4) OR 
       (m.postprint_tag = 5) OR (m.postprint_tag = 7)

 UNION ALL 

SELECT id + 200000000000000000 as id, 'PERCHK' + CAST(id AS varchar(15)) as crUniqueId,
       check_amount, 'P' as crType, business_date as activationDate,
       business_date as creationDate, identify_description as reasonLine1, check_no
  FROM cd_personal_checks 

HOWEVER, I have reached another obstacle. I need to get data from another table (which has a link to each of the two tables mentioned above)

In both select statments above I need to add a field called “dispositionAmount” which is the check_amount – SUM(md_cr_pending.current_amount)

md_cr_pending table has a master_id field that links with md_master.id
md_cr_pending table has a cd_personal_check_id field that links with cd_personal_checks.id

Thanks for any help

Answer 1

Since you did not post the third table and the forignKeys I only can help with this:

CREATE VIEW ViewCR AS  

    SELECT id  + 100000000000000000 AS id, 
    a.external_code + CAST(id AS varchar(15)) as crUniqueId, 
    m.check_amount, 
    'C' as crType, 
    m.postprint_date as activationDate, 
    m.postprint_date as creationDate, 
    m.memo_explanation as reasonLine1, 
    m.check_no,
    m.check_amount - sh.sumAmount As Difference 
    FROM MD_Master m
    Join accounts a on m.account_tag = a.acct_id
    INNER JOIN (SELECT forignKeyID, 
                SUM(md_cr_pending.current_amount) as sumAmount 
                FROM Table 3
                Group BY forignKeyID) sh ON sh.forignKeyID = m.ID
    WHERE (m.postprint_tag = 2) OR (m.postprint_tag = 4) OR 
          (m.postprint_tag = 5) OR (m.postprint_tag = 7)

    UNION ALL 

    SELECT id + 200000000000000000 as id, 
    'PERCHK' + CAST(id AS varchar(15)) as crUniqueId, 
    check_amount, 
    'P' as crType, 
    business_date as activationDate, 
    business_date as creationDate, 
    identify_description as reasonLine1, 
    check_no,
    check_amount - sh.sumAmount As Difference 
    FROM cd_personal_checks 
    INNER JOIN (SELECT forignKeyID, 
                SUM(md_cr_pending.current_amount) as sumAmount 
                FROM Table 3
                Group BY forignKeyID) sh 
                ON sh.forignKeyID = cd_personal_checks.ID