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How to exclude duplicates from Select with UNION?
Message
From
28/03/2006 23:43:14
Neil Mc Donald
Cencom Systems P/L
The Sun, Australia
 
General information
Forum:
Visual FoxPro
Category:
Databases,Tables, Views, Indexing and SQL syntax
Environment versions
Visual FoxPro:
VFP 9
OS:
Windows XP SP2
Database:
Visual FoxPro
Miscellaneous
Thread ID:
01108675
Message ID:
01108681
Views:
16
Hi,
Would the DISTINCT clause be what your looking for ?

>Hi everybody,
>
>Here is my code to get queues by role
>
>
>local lcSQLStr, lcFilter1, lcFilter2
>
>lcFilter1 = [Employee_Queue_Profiles.cUsGrLink_fk = '] + crsUsGrLink.cUsGrLink_pk + [']
>lcFilter2 = [Queue_Names.cDepartment_Code = '] + ;
>	strtran(left(cDepartments.cDepartment_Code,1),'C','O') + [']
>
>text TO lcSQLStr TEXTMERGE noshow
>   SELECT 1 as iSelected, ;
>   Employee_Queue_Profiles.iDefault_queue_flag as iDefault_Queue_Flag, ;
>   Queue_Names.cQueue_names_pk, Queue_Names.cQueue_name, ;
>   Queue_Names.cDepartment_code, Queue_Names.cQueue_type_code, Queue_Names.cQueue_type_id ;
>   FROM Employee_Queue_profiles INNER JOIN Queue_Names ;
>   ON Employee_Queue_Profiles.cQueue_Names_fk = Queue_Names.cQueue_Names_pk ;
>   WHERE Employee_Queue_Profiles.iActive_Flag = 1 AND <<m.lcFilter1>> ;
>   UNION ;
>   select 0 as iSelected, 0 as iDefault_Queue_flag, ;
>    Queue_Names.cQueue_names_pk, Queue_Names.cQueue_name, ;
>   Queue_Names.cDepartment_code, Queue_Names.cQueue_type_code, Queue_Names.cQueue_type_id ;
>   FROM Queue_Names WHERE Queue_Names.cQueue_Name NOT LIKE 'UNASSIGNED%' AND <<m.lcFilter2>> ;
>   ORDER BY 4
>ENDTEXT
>
>if RunSQL(m.lcSQLStr, 'curTempQueues')
>	zap in cQueueNames
>	insert into cQueueNames select * from curTempQueues
>	GO TOP IN cQueueNames
>	use in curTempQueues
>endif
>
>If I have queues in Employee_Queue_Profile, I don't want them listed twice. However, currently they are listed twice, I believe, because of extra fields. Is my only option to do this in two separate select statements?
>
>Thanks a lot in advance.
Regards N Mc Donald
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