Performing UNION/UNION ALL in views

I have two databases (DB1 AND DB2) in same server. I have to create two views (V1 AND V2) respectively in DB1 and DB2. And I have to make an union/union all operation in these views (V1 and V2). Is this possible.???.
Or can I create a single view instead of two views in such a way that the single view contains an union/union all operation between the data taken from two DBs (DB1 and DB2).?
Any ideas or suggestions on these questions. Your help is well appreciated.
Thanks in advance.

Or can I create a single view instead of two views in such a way that the single view contains an union/union all operation between the data taken from two DBs (DB1 and DB2).?
Make sure you do very thorough testing if you plan to use UNION since that requires a sort operation. And that means that the data from one query has to be sent to the other server before it can be sorted.
So a query issued on DB1 might sent the DB1 data to DB2 and then send the sorted result back to DB1. But the same query issued on DB2 would already have the DB2 data so after the DB1 data is sent to DB2 and sorted the query is done.
That is, in one case the entire result set may be sent over the network from one server to the other instead of just one table.

Similar Messages

Problems creating a view that's a union of two other views

Hello all you Oracle folks,
I'm pretty new to this Oracle thing, coming over from SQL Server where life was simple. Here's my issue;
I am trying to create a view that is a union of two other views.
I can run the top SELECT of this view (before the UNION) and it works no problem, and I can run the bottom SELECT (after the UNION) and it also works with no problem. I can run a DESC on both views involved, and those also work without any problem.
When I try to run the SQL all together though, I get this;
SQL> CREATE materialized view trkmaster.cmp_pmr_union refresh force ON demand AS SELECT 'CMR'
2 "Ticket_System", "Id_col" "Ticket", "Submitter", "Submit_Date", "Submit_To",
3 "Actual_Activity_Start_Date" "Start_Date", "Actual_Activity_Start_Time" "Start_Time",
4 "Actual_Activity_End_Date" "End_Date", "Actual_Activity_End_Time" "End_Time",
5 "Close_Date", "Risk_Level" "Level", "Activity_Type" "Type", "Activity_Category"
6 "Category", "Hardware_Name" "Hardware", "Platform", "Application_Name" "Application",
7 "Completion_Status" "Status", "Area_CMPO" "Owner", "Outage_Minutes" "Total_Outage_Mins",
8 "Acorde_Downtime__in_minutes_" "Acorde", "Atlas", "Corporate_Email_Downtime"
9 "Corporate_Email", "Data_Warehouse_Downtime__In_M6" "Data_Warehouse",
10 "E__Commerce_Downtime__In_Mins_" "ECommerce", "FMDS__FIVR_" "FMDS_FIVR",
11 "FMDS_Hotels_Downtime" "FMDS_Hotels", "FMDS_Internet_Downtime" "FMDS_Internet",
12 "FMDS_Resv__Ctr_Downtime" "FMDS_Resv_Ctr", "GDS_Downtime__In_Mins_" "GDS",
13 "HI_Online_Downtime__In_Mins_" "HI_Online", "Holidex__CRO____In_Mins_" "Holidex_CRO",
14 "Holidex__Hotels____In_Mins_" "Holidex_Hotels", "Hyperion_Essbase",
15 "IHGMail_Downtime__In_Mins_" "IHG_Mail", "Kofax_Downtime__in_minutes_" "Kofax",
16 "PeopleSoft_Fin_Downtime_In_Mi1" "Peoplesoft", "PERFORM__HIRO____In_Mins_" "Perform_HIRO"
17 FROM CMP.CHRQVCHANGE_MANAGEMENT_REQUEST UNION SELECT 'PMR' "Ticket_System", "Id_col"
18 "Ticket", "Submitter", "Submit_Date", "Submit_To", "Problem_Start_Date" "Start_Date",
19 "Problem_Start_Time" "Start_Time", "Problem_End_Date" "End_Date", "Problem_End_Time"
20 "End_Time", "Close_Date", "Severity_Level" "Level", "Problem_Type" "Type",
21 "Occurrence_Type" "Category", "Hardware_Name" "Hardware", "Platform", "Application_Name"
22 "Application", "Close_Code" "Status", "Problem_Owner" "Owner",
23 "TOTAL_Outage_Time__If_Any_" "Total_Outage_Time", "Acorde_Downtime__in_minutes_" "Acorde",
24 "Atlas", "Corporate_Email_Downtime" "Corporate_Email", "Data_Warehouse_Downtime__In_M6"
25 "Data_Warehouse", "E__Commerce_Outage_Time__Mins_" "ECommerce", "FMDS__FIVR_" "FMDS_FIVR",
26 "FMDS_Hotels_Outage_Time__In_M5" "FMDS_Hotels", "FMDS_Internet_Outage_Time__Mi4"
27 "FMDS_Internet", "FMDS_Resv__Ctr_Outage_Time__M3" "FMDS_Resv_Ctr",
28 "GDS_Outage_Time__Mins_" "GDS", "HI_Online_Outage_Time__In_Min2" "HI_Online",
29 "Holidex__CRO____In_Mins_" "Holidex_CRO", "Holidex__Hotels____In_Mins_" "Holidex_Hotels",
30 "Hyperion_Essbase", "IHG_Mail_Outage_Time__In_Mins_" "IHG_Mail",
31 "Kofax_Downtime__in_minutes_" "Kofax", "PeopleSoft_Fin_Downtime_In_Mi1" "Peoplesoft",
32 "PERFORM__HIRO____In_Mins_" "Perform_HIRO" FROM PMR.CHRQVPROBLEM_MANAGEMENT;
"PERFORM__HIRO____In_Mins_" "Perform_HIRO" FROM PMR.CHRQVPROBLEM_MANAGEMENT
ERROR at line 32:
ORA-00942: table or view does not exist
The 'CMR' and 'PMR' as Ticket_System is me trying to assign a literal as a newly created column.
All the data types match from one view to the other.
If I switch around the SQL so the 'CMR' view is at the bottom and the 'PMR' view is at the top, it still errors out on the 'PMR' view as not existing, even though I can DESC it and run the SELECT using that view. A coworker thinks it could be some kind of view alias issue (?).
I know the view exists, and I can access it no problem. Any ideas why this isn't working? It seems so simple, I could do this in a heartbeat in SQL Server. I have very few hairs left to rip out, so any help would be appreciated.

SELECT 'CMR' "Ticket_System",
"Id_col" "Ticket",
....you have wrapped up your columns with a double quotes and use an alias. i tried the same thing
but using a different table and it does not work.
SQL> desc emp;
Name                                      Null?    Type
EMPNO                                     NOT NULL NUMBER(4)
ENAME                                              VARCHAR2(10)
JOB                                                VARCHAR2(9)
MGR                                                NUMBER(4)
HIREDATE                                           DATE
SAL                                                NUMBER(7,2)
COMM                                               NUMBER(7,2)
DEPTNO                                    NOT NULL NUMBER(2)
SQL> select "empno" "employee_number"
2    from emp;
select "empno" "employee_number"
ERROR at line 1:
ORA-00904: "empno": invalid identifier
SQL> how were you able to run the top level of your SQL before the UNION clause? did you run it thru some tools
other than SQL*Plus?

How do I write a Dll to perform a union in visual studio for use in LabVIEW?

Hello,
I'm new to writing dll(s). I'm attempting to write a Dll that will perform a union on a number from LabVIEW and then return the result to LabVIEW for my use. I've been struggling with this for a few days and I'm finally giving in to get some help.
This screenshot is the only description that I have to help me with what I am trying to do. Basically, I'm trying to pass a value that will be different based on a measured partial discharge value. In the screen below, the value used is "1061111989" This number is my reading. I need to pass this value from labVIEW into my dll to perform a union on it.
In my Dll, I need to write MeterReading.IntVal's value and get the MeterReading.FloatVal back.
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Thanks in advance, -Chris
-Chris
"You must be some sort of an engineer?" -Close Friend
Solved!
Go to Solution.

Sometimes, I try to solve simple issues in very complicated ways. What got me so confused here was the solution from the engineer of the device that I am reading from was using a union to get the value. I'm not familiar with unions so I thought that it was some structure that was not creatable in LabVIEW. Anyways, a typecast to single point gave me the proper value. Thank you.
-Chris
"You must be some sort of an engineer?" -Close Friend

ODI 10g Union,Union All,Minus

Hello,
I have to use union,union all or minus set on ODI 10.But it doesn't have uninon,union all minus data set like in ODİ 11.How can ı use union statement in odi 10 g?For example I have to union 6 table in odi 10g.How it can be ?
Thnx a kot

Thx a lot Jerome .it works
I have one more question:
This select captured changed datas.I will delete dataas which returns from this select.And then I will insert new datas.
I added to IKM COntrol append a new step like this:
delete from <%=odiRef.getTable("L","TARG_NAME","A")%> T WHERE (<%=odiRef.getTargetColList("", "t.[COL_NAME]", ", ", "\n", "UK")%>) in
SELECT PK_ID
FROM <%=odiRef.getFrom()%>
WHERE (1=1)
<%=snpRef.getJoin()%>
<%=snpRef.getFilter()%>
<%=snpRef.getJrnFilter()%>
<%=snpRef.getGrpBy()%>
<%=snpRef.getHaving()%>
/*commit*/
I selected "UK" from target.
But I dont know that it works true.I selected PK_ID from source but which PK_ID Will I select?When targets UK is equal to source UK(PK_ID) then these datas will be deleted.Changed datas will be inserted.How can I modify this step?İs there any solution to do this step?Can I get dynamicly PK_ID?
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Union of all the selection variables

Hi All,
Is there a way to get a Union of all the available values of selection variables in BEx? For example, if I have a selection variable for 0material and 0country, and I put in 1234 and USA as the selection input. Normally, you would get a report with '1234' AND 'USA'. For my case, I want to get the report with '1234' OR 'USA'. Basically, I want report with both 0Material = '1234' OR with 0Country = 'USA' in one report. Thanks in advance for your advice.
VV

To only list the material for a particular country.....In the first step, we would list the country before the material in the "rows" section.
In the "Columns" section, it sounds like there is only one key figure column needed with the variable for the "Country", but do NOT restrict by the "Material". This should work whether you are showing a count of items or $ cost.
If this is not right... maybe we could see a simple example from you showing 5 total records with what you want to see in the final report for the columns and rows for 3 records you are trying to capture, etc....
Edited by: Sharon West on Nov 26, 2008 9:41 AM

집합 연산자(UNION, UNION ALL, INTERSECT, MINUS) 사용 예제

제품 : ORACLE SERVER
작성날짜 : 2002-04-12
집합 연산자(UNION, UNION ALL, INTERSECT, MINUS) 사용 예제
=========================================================
Purpose
집합 연산자인 union, union all, intersect, minus 의 사용방법을 알아보자.
Explanation
오라클에서 사용할 수 있는 집합 연산자는 union, union all, intersect,
minus 가 있다.
아래의 table은 예제에서 사용될 테이블이다.
SQL> select * from dept_a;
DEPTNO DNAME LOC
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS BOSTON
50 RND SEOUL
SQL> select * from dept_b;
DEPTNO DNAME LOC
20 RESEARCH DALLAS
30 SALES CHICAGO
60 FNA SEOUL
1. UNION Operator
union은 두 테이블의 자료를 하나의 결과로 가져올 때,
중복된 row가 있을 경우 하나의 row만을 return한다..
select 문 절에 사용하는 distinct 와 같은 효과로 생각할 수 있다.
SQL> select deptno, dname from dept_a
2 union
3 select deptno, dname from dept_b;
DEPTNO DNAME
10 ACCOUNTING
20 RESEARCH
30 SALES
40 OPERATIONS
50 RND
60 FNA
6 rows selected.
2. UNION ALL Operator
union all 은 union이 distinct 를 사용할 때와 달리 중복된
결과를 모두 return한다. 즉, 결과로 나오는 모든 row를 보여주게 된다.
SQL> select deptno, dname from dept_a
2 union all
3 select deptno, dname from dept_b;
DEPTNO DNAME
10 ACCOUNTING
20 RESEARCH
30 SALES
40 OPERATIONS
50 RND
20 RESEARCH
30 SALES
60 FNA
8 rows selected.
3. INTERSECT Operator
intersect 는 두 테이블의 결과중에 겹치는 row만을 return한다.
즉, 교집합된 결과로 생각할 수 있다.
SQL> select deptno, dname from dept_a
2 intersect
3 select deptno, dname from dept_b;
DEPTNO DNAME
20 RESEARCH
30 SALES
4. MINUS Operator
minus operator는 첫번째 테이블에서 두번째 테이블의 데이터를
제외한 나머지 row만 return한다.
SQL> select deptno, dname from dept_a
2 minus
3 select deptno, dname from dept_b;
DEPTNO DNAME
10 ACCOUNTING
40 OPERATIONS
50 RND

Definitely a bug:
SQL> ALTER SESSION SET NLS_SORT=BINARY_CI
2 /
Session altered.
SQL> ALTER SESSION SET NLS_COMP=LINGUISTIC
2 /
Session altered.
SQL> with utbl as (
2                select chr(ascii('A') + level - 1) letter
3                  from dual
4                  connect by level < 27
5               ),
6       ltbl as (
7                select chr(ascii('a') + level - 1) letter
8                  from dual
9                  connect by level < 27
10               )
11   select letter
12     from utbl
13 minus
14   select letter
15     from ltbl
16 /
L
A
B
C
D
E
F
G
H
I
J
K
L
L
M
N
O
P
Q
R
S
T
U
V
L
W
X
Y
Z
26 rows selected.
SQL> with utbl as (
2                select chr(ascii('A') + level - 1) letter
3                  from dual
4                  connect by level < 27
5               ),
6       ltbl as (
7                select chr(ascii('a') + level - 1) letter
8                  from dual
9                  connect by level < 27
10               )
11 select * from (
12   select letter
13     from utbl
14 minus
15   select letter
16     from ltbl
17 )
18 /
no rows selected
SQL> SY.

Grant access to all the views created in user schema to another schema

How to grant access for all the views created in own HAGGIS schema to comqdhb schema on the HAGGIS database.
Oracle Grant Privileges
===============
Object privileges assign the right to perform a particular operation on a specific object
I read that we can use select 'grant select on' ||view_name||'HAGGIS' user_views where owner='COMQDHB'
Is this right
Oracle System Privileges
===============
System privileges should be used in only cases where security isnt important,because a single grant statement could remove all security from the table
Role based security
============
Role security allows you to gather related grants into a collection-since the role is a predefined collection of privileges that are grouped together.privileges are easier to assign to users.
[http://www.dba-oracle.com/art_builder_grant_sec.htm]
can we grant select update to all the views at a time to the other schema.
Are there any other ways to secure the data other than creating users and assigning roles.
Thank you
Edited by: Trooper on Dec 23, 2008 9:24 AM

I think what was suggested was that you use SQL to generate the grants on each and every view, that is, you use SQL to generate SQL where the SQL being generated is "grant select on view_name to role'"
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Example using SQL to generate SQL
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http://www.jlcomp.demon.co.uk/faq/privileges.html
HTH -- Mark D Powell --

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Hi,
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If the problem is a corrupt view, cleanviews will clear it. I'm sure there are other causes besides corrupt views, but I can't think of any at the moment.
Does it work in Safe mode? To open Outlook in Safe mode: Close Outlook then hold Ctrl as you click on the Outlook icon. You'll get a message asking if you want to start in Safe mode. Click Ok.
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Performing UNION/UNION ALL in views

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