DOCUMENT:Q122648  10-NOV-1994  [ODBC]
TITLE   :BUG: Outer Join with Another Table in FROM May Cause SQL_ERROR
PRODUCT :Open Database Connectivity (ODBC)
PROD/VER:1.02.3231
OPER/SYS:WINDOWS
KEYWORDS:kbbug1.02.3231 kbprg kberrmsg

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The information in this article applies to:

 - Microsoft Open Data Base 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, as follows:

   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 reference words: 1.02.3231 Windows NT
KBCategory: kbprg kberrmsg
KBSubcategory:

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