Q122648: BUG: Outer Join with Another Table in FROM May Cause SQL_ERROR

Article: Q122648
Product(s): Open Database Connectivity (ODBC)
Version(s): WINDOWS:1.0
Operating System(s): 
Keyword(s): kbBug kbISS
Last Modified: 27-JUL-2001

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The information in this article applies to:

- Microsoft Open Database Connectivity, version 1.0 
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BUG# Addon_Bugs: 10567 (1.02.3231)

SYMPTOMS
========

A left outer join between two tables along with a third table in the FROM clause
can cause SQL_ERROR to be returned. This happens only when the outer join escape
syntax is used and the third table appears after the escape sequence in the FROM
clause.

SQLExecDirect:

     SELECT t1.col1, t1.col2, t2.col1, t2.col2
     FROM {oj testoj1 t1 left outer join testoj2 t2 on t1.col1 = t2.col1},
          testoj3 t3,
     WHERE t3.col1 = t1.col1

This generates a syntax error:

  SQLSTATE = 37000 NativeError = 102
  ErrorMsg = [Microsoft][ODBC SQL Server Driver][SQL Server] Incorrect syntax
  near ','

CAUSE
=====

The SQL Server driver incorrectly translates the above SELECT statement to:

     SELECT t1.col1, t1.col2, t2.col1, t2.col2
     FROM  testoj1 t1,  testoj2 t2
     WHERE  t1.col1 *=  t2.col1 ,  testoj3 t3
     WHERE t3.col1 = t1.col1

This is incorrect syntax; hence, it causes the error.

WORKAROUND
==========

Rewrite the SELECT statement such that testoj3 appears before the outer join
escape clause:

  SELECT t1.col1, t1.col2, t2.col1, t2.col2
  FROM   testoj3 t3,

  {oj testoj1 t1 left outer join testoj2 t2 on t1.col1 = t2.col1}

  WHERE t3.col1 = t1.col1

STATUS
======

Microsoft has confirmed this to be a problem in ODBC SQL Server Driver versions
1.02.3231. We are researching this problem and will post new information here in
the Microsoft Knowledge Base as it becomes available.

Additional query words: 1.02.3231 kbbug1.02.3231 kbprg kberrmsg

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Keywords          : kbBug kbISS 
Technology        : kbAudDeveloper kbODBCSearch kbODBC100
Version           : WINDOWS:1.0
Issue type        : kbbug

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