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Joins in X++ into T-SQL

1. join in X++:
select AccountNum from custTable
    join TaxGroupId from custGroup
    where custGroup.CustGroup == custTable.CustGroup;
CROSS JOIN in T-SQL:
SELECT T1.ACCOUNTNUM, T1.RECID, T2.TAXGROUPID, T2.RECID
FROM CUSTTABLE T1 CROSS JOIN CUSTGROUP T2
WHERE ((T1.PARTITION=?) AND (T1.DATAAREAID=?))
  AND (((T2.PARTITION=?) AND (T2.DATAAREAID=?)) 
   AND (T2.CUSTGROUP=T1.CUSTGROUP))

2. outer join in X++:
select AccountNum from custTable
    outer join AccountID from custBankAccount
    where custBankAccount.CustAccount == custTable.AccountNum;
LEFT OUTER JOIN in T-SQL:
SELECT T1.ACCOUNTNUM, T1.RECID, T2.ACCOUNTID, T2.RECID
FROM CUSTTABLE T1 LEFT OUTER JOIN CUSTBANKACCOUNT T2
ON (((T2.PARTITION=?) AND (T2.DATAAREAID=?))
AND (T1.ACCOUNTNUM=T2.CUSTACCOUNT))
WHERE ((T1.PARTITION=?) AND (T1.DATAAREAID=?))

3. exists join in X++:
select AccountNum from custBankAccount
    exists join custTable
    where custBankAccount.CustAccount == custTable.AccountNum;
EXISTS (SELECT 'x'...) in T-SQL:
SELECT T1.ACCOUNTNUM, T1.RECID
FROM CUSTBANKACCOUNT T1
WHERE ((T1.PARTITION=?) AND (T1.DATAAREAID=?))
AND EXISTS (SELECT 'x'
            FROM CUSTTABLE T2
            WHERE (((T2.PARTITION=?) AND (T2.DATAAREAID=?))
              AND  (T1.CUSTACCOUNT=T2.ACCOUNTNUM)))

4. notexists join in X++:
select AccountNum from custBankAccount
    notexists join custTable
    where custBankAccount.CustAccount == custTable.AccountNum;
NOT (EXISTS (SELECT 'x'...)) in T-SQL:
SELECT T1.ACCOUNTNUM, T1.RECID
FROM CUSTBANKACCOUNT T1
WHERE ((T1.PARTITION=?) AND (T1.DATAAREAID=?))
AND NOT (EXISTS (SELECT 'x'
                 FROM CUSTTABLE T2
                 WHERE (((T2.PARTITION=?) AND (T2.DATAAREAID=?))
                   AND  (T1.CUSTACCOUNT=T2.ACCOUNTNUM))))

5. join after exists join in X++:
select AccountNum from custBankAccount
    exists join custTable
    where custBankAccount.CustAccount == custTable.AccountNum
    join TaxGroupId from custGroup
    where custGroup.CustGroup == custTable.CustGroup;
EXISTS (SELECT 'x'...CROSS JOIN...) in T-SQL:
SELECT T1.ACCOUNTNUM, T1.RECID
FROM CUSTBANKACCOUNT T1
WHERE ((T1.PARTITION=?) AND (T1.DATAAREAID=?))
AND EXISTS (SELECT 'x'
            FROM CUSTTABLE T2 CROSS JOIN CUSTGROUP T3
            WHERE (((T2.PARTITION=?) AND (T2.DATAAREAID=?)) 
               AND (T1.CUSTACCOUNT=T2.ACCOUNTNUM)) 
              AND (((T3.PARTITION=?) AND (T3.DATAAREAID=?)) 
               AND (T3.CUSTGROUP=T2.CUSTGROUP)))

6. exists join after exists join in X++:
select AccountNum from custBankAccount
    exists join custTable
    where custBankAccount.CustAccount == custTable.AccountNum
    exists join custGroup
    where custGroup.CustGroup  == custTable.CustGroup
       && custGroup.TaxGroupId == "Std";
EXISTS (SELECT 'x'... EXISTS (SELECT 'x'...)) in T-SQL:
SELECT T1.ACCOUNTNUM, T1.RECID
FROM CUSTBANKACCOUNT T1
WHERE ((T1.PARTITION=?) AND (T1.DATAAREAID=?))

AND EXISTS (SELECT 'x' FROM CUSTTABLE T2 
            WHERE (((T2.PARTITION=?) AND (T2.DATAAREAID=?)) 
               AND (T1.CUSTACCOUNT=T2.ACCOUNTNUM)) 
               AND EXISTS (SELECT 'x' 
                           FROM CUSTGROUP T3 
                           WHERE (((T3.PARTITION=?) AND (T3.DATAAREAID=?)) 
                              AND ((T3.CUSTGROUP=T2.CUSTGROUP) AND (T3.TAXGROUPID=?)))))

Conclusion
each exists join is considered as a separate statement, but any join after exists joinis coupled or nested.
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