FIX: LEFT OUTER JOIN on a View that Uses the DISTINCT Keyword Produces Incorrect Results

This article was previously published under Q277698
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BUG #: 58544 (SQLBUG_70)
A SELECT query that contains a LEFT OUTER JOIN on a nested view, which uses the DISTINCT keyword, produces incorrect results in SQL Server 7.0. For example:
use pubsgoset nocount ongoCREATE TABLE [A] (	[exch_server] [varchar] (10) NOT NULL ,	[note_id] [varchar] (10) NOT NULL ,	[entity_id] [varchar] (10) NOT NULL ) ON [PRIMARY]GOCREATE TABLE [B] (	[note_id] [varchar] (10) NOT NULL ,	[entity_id] [varchar] (10) NOT NULL ) ON [PRIMARY] GOCREATE TABLE [C] (	[channel_entity_id] [varchar] (10) NOT NULL ,	[entity_id] [varchar] (10) NOT NULL ) ON [PRIMARY]GOCREATE TABLE [D] (	[exch_server] [varchar] (10) NOT NULL ,	[entity_id] [varchar] (10) NOT NULL ) ON [PRIMARY]GOCREATE VIEW viewEASSELECT DISTINCT D.exch_server              , C.entity_id           FROM C INNER JOIN                D              ON C.channel_entity_id              = D.entity_idGOCREATE VIEW viewFASSELECT viewE.exch_server     , B.note_id     , B.entity_id  FROM viewE  INNER JOIN       B     ON viewE.entity_id     = B.entity_idGOINSERT [A] VALUES ('testA','1','5')GOINSERT [B] VALUES ('1','5')GO	INSERT [C] VALUES ('2','5')GOINSERT [D] VALUES ('testB','2')GOset nocount offGOSELECT A.note_id      ,A.entity_id      ,viewF.exch_server  FROM A LEFT OUTER JOIN       viewF     ON A.note_id     = viewF.note_id  Where viewF.exch_server IS NULLGO-- The preceding query returns one row instead of zero rows.<BR/>DROP TABLE [A]GODROP TABLE [B]GODROP TABLE [C]GODROP TABLE [D]GODROP VIEW viewFGODROP VIEW viewEGO				
To work around this problem, use any of the following methods:
  • Remove the DISTINCT keyword from viewE.
  • Make either viewE or viewF a permanent table.
  • Make both viewE and viewF permanent tables.
  • Use nested selects and derived tables in the final query.
Microsoft has confirmed this to be a problem in SQL Server 7.0. This problem has been corrected in U.S. Service Pack 3 for Microsoft SQL Server 7.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
274799 INF: How to Obtain Service Pack 3 for Microsoft SQL Server 7.0 and Microsoft Data Engine (MSDE) 1.0
For more information, contact your primary support provider.

Article ID: 277698 - Last Review: 10/21/2013 02:52:37 - Revision: 2.1

Microsoft SQL Server 7.0 Standard Edition

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