Create a view from multiple tables

Hi all,
I am a newbie, so sorry if this is a "basic" question.
I had 3 tables TAB1, TAB2 and TAB3
TAB1 has
STU_ID(pk), NAME, GRADE, ADDRESS
TAB2 has
COURSE_ID(pk), STU_ID(fk), COURSE_NAME, ROOM_NUM, TIME, DAY
TAB3 has
MENTOR_NAME, TITLE, AVAILABLE_DAYS
Now I want to create a view(or query) that returns STU_ID, COURSE_NAME, NAME, GRADE, MENTOR_NAME and TITLE.
When I tried writing a query like
SELECT a.STU_ID, b.COURSE_NAME, a.NAME, a.GRADE, c.MENTOR_NAME, a.TITLE
FROM TAB1 a, TAB2 b, TAB3 c
WHERE a.STU_ID=b.STU_ID
I am getting multiple results..like I'm getting Mentor name 4 times, name 4 times like that.
So can anybody help me in writing the query for this....a "VIEW" would be appreciated.
Thanks In Advance
Srra

You query should return all the columns in the select list once for each and every row that meets the specified join condition, how does this differ from what you are getting?
So if tableA is the student table with only one row per student you would expect to see the student data duplicated once for every matching course row found in tableB, and so on when tableC is added in.
If you need help please post partial results and then explain what results you want.
HTH -- Mark D Powell --
PS as sb mention you forgot your join condition to tableC which would multiply tableC by the other tables.
Edited by: Mark D Powell on Feb 3, 2010 9:18 AM

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[ADF Help] How to create a view for multiple tables

Hi,
I am using Jdeveloper 11G and ADF framework, and trying to create a view to update multiple tables.
ex:
Table A has these fields: ID, Name
Table B has these fields: ID, Address
A.ID and B.ID are primary keys.
B.ID has FK relationship with A.ID
(basically, these tables have one-to-one relation)
I want to create a view object, which contains these fields: B.ID (or A.ID), A.Name, B.Address.
So I can execute C,R,U,D for both tables.
I create these tables in DB, and create entity objects for these tables.
So there are 2 entity objects and 1 association.
Then I create a view object based on B and add fields of A into the view:
If the association is not a "Composition Association",
when I run the model ("Oracle Business Component Browser") and try to insert new data, fields of A can't edit.
If the association is a "Composition Association", and click the insert button, I will get
"oracle.jbo.InvalidOwnerException: JBO-25030: Failed to find or invalidate owning entity"
If I create a view object based on A and add filed of B into the view:
When I run the model and try to insert new data, fields of B can't edit, no matter the association is or is not a composition association.
So... how can I create a view for multiple tables correctly?
Thanks for any advices!
Here are some pictures about my problem, if there is any unclear point, please let me know.
http://leonjava.blogspot.com/2009_10_01_archive.html
(A is Prod, B is CpuSocket)
Edited by: user8093176 on Oct 25, 2009 12:29 AM

Hi Branislav,
Thanks, but the result is same ....
In the step 2 of creating view object, I can select entity objects to be added in to the view.
If I select A first, and then select B (the "Source Usage" of B is A), then finishing the wizards.
When I try to create a new record in the view, I can't edit any properties of B (those files are disabled).
If I select B first, and then select A in crating view object, the result is similar ...
Thanks for any further suggestion.
Leon

HOW CAN I CREATE A VIEW FROM SAME TABLE WHERE I NEED COLUMNS DETAILS FROM DIFFERENT ROWS IN THE SAME TABLE

i have a table1 on the top, but i want to create a view from table 1 as view mentioned beneath the table 2. Could any of you please help me.
table1
ID
office
employee
activity
1
246
-9999
698
2
##-99
21480
698
3
104
-9999
7025
4
##-99
88908
7025
5
108
-9999
2415
6
##-99
17135
2415
7
246
-9999
698
8
##-99
21480
698
9
104
-9999
7025
10
##-99
88908
7025
11
108
-9999
2415
12
##-99
17135
2415
view
ID
office
ID1
employee
activity
1
246
2
21480
698
3
104
4
88908
7025
5
108
6
17135
2415
7
246
8
21480
698
9
104
10
88908
7025
11
108
12
17135
2415

declare @forumsTable table (ID int, officeID int, employeeID INT, activityID int)
insert into @forumsTable (ID, officeID, employeeID, activityID)
values
(1 ,246, -9999, 698 ),
(2 ,-99, 21480, 698 ),
(3 ,104, -9999, 7025),
(4 ,-99, 88908, 7025),
(5 ,108, -9999, 2415),
(6 ,-99, 17135, 2415),
(7 ,246, -9999, 698 ),
(8 ,-99, 21480, 698 ),
(9 ,104, -9999, 7025),
(10 ,-99, 88908, 7025),
(11 ,108, -9999, 2415),
(12 ,-99, 17135, 2415)
select f1.ID, f1.officeID, f2.ID as ID1, f1.employeeID, f1.activityID
from @forumsTable f1
inner join @forumsTable f2
on f1.activityID = f2.activityID
and f1.officeID > 0
and f2.employeeID > 0
and f1.id - f2.id = -1
You really need to improve the relationship here.
Perhaps you could make office and activity an exclusive pair.

View from multiple tables

Hi,
I would like to create a view from 4 different tables. How do I do it?.
Say for example, I need user_id from table A which has the trans_id in table B and C. and I need to get a admin_id from table D and show these related fields in one single row . I'm trying to create a view to achieve this.
Pls help.
Thanks,
Ananth

Are you asking how to write the SQL, or just how to define the view (which I guess is pretty much the same thing)?

Create object type from multiple tables for select statement

Hi there,
I have 3 tables as given below and I wish to create an object type to group selected columns as 'attribute' from multiple tables.
I need to create 2 input parameters to pass in - 'attribute' and 'attribute value' in PL/SQL and these 2 parameters will be
passing in with 'column name' and 'column value'. e.g. 'configuration' - the column name, 'eval' - the column value.
Then, the PL/SQL will execute the select statement with the column and column value provided to output the record.
Pls advise and thank you.
table ccitemnumber
name                           null     type
ccitemnumber                   not null varchar2(20)
configuration                           varchar2(20)
item_type                               varchar2(30)
table productmodel
productmodelnumber             not null varchar2(6)
description                             varchar2(60)
accesstimems                            number
numberofheads                           varchar2(2)
generation                              varchar2(10)
numberofdiscs                           varchar2(2)
factoryapplication                      varchar2(150)
table topmodel
stmodelnumber                  not null varchar2(30)
productfamily                           varchar2(60
formfactor                              varchar2(10)
modelheight                             varchar2(10)
formattedcapacity                       number
formattedcapacity_uom                   varchar2(20)
object type in database
configuration                           varchar2(20)
item_type                               varchar2(30)
numberofheads                           varchar2(2)
generation                              varchar2(10)
numberofdiscs                           varchar2(2)
factoryapplication                      varchar2(150)
modelheight                             varchar2(10)
formattedcapacity                       number
formattedcapac

user12043838 wrote:
Reason to do this as these fields are required to be grouped together as they are created in different tables. They are treated as 'attribute' (consists of many columns) of the part number. So, the PL/SQL is requested to design in a way able for user to pass in the column name and column value or part number, then the select statement should be able to query for the records. Another reason is a new column can be added easily without keep modifying those effected programs. Reuseable too.This basically equates to ... hard to code, hard to maintain, and poor performance.
Are you really sure you want to do this? This isn't going to be easy-street as you seem to think it is, but it's a one way street to a poorly performing system with security vulnerabilities (google SQL Injection).
I would highly recommend you reconsider your design decision here.

Create a view from 10 tables

Hi Experts,
I want to create a view from 10 pricing tables rather than write 10 different select query in my application. Most of the columns of the pricing tables are same. I want all the data from these tables into the respective columns. Further I want an indicator as to which table does this record belong to. How can I achieve this?
Ex:
Table 1 columns: kappl kschl vkorg vtweg vkgrp
Table 2 columns: kappl kschl vkorg vtweg matkl matnr
if each table has two records, I want 4 records in my view in the respective columns along with the indicator that this record belongs to a specific column.
Regards

Hi,
Placing 10 tables in one view will drastically affect performance. This is highly unrecommended.
Anyhow if you insist on doing so you can create [database view|http://help.sap.com/saphelp_nw04/helpdata/en/36/74c0358373003ee10000009b38f839/frameset.htm] or use explicitly joins in your program.
Keep in mind that althought it is possible to use projection (only selection of choosen column) it is not logically appropriate to locate which table this column belongs to (as far as we are talking about key fields) as both have the same field as key field.
On the other hand when using projection for non-key columns it is you who define what is to be selected and how, therefore you know which column belongs to which table.
i.e
data: begin of st,
          lgart type t512w-lgart,
          molga type t512w-molga,
          lgtxt   type t512t-lgtxt,
        end of st.
select w~molga w~lgart t~lgtxt   "<- here using aliases you know which column is taken from which table
into st
from T512W as W
inner join T512T as T on
     W~LGART = T~LGART.
write: / st-lgart, st-molga, st-lgtxt.
endselect.
In this example lgart (key field) can be taken from either t512w or t512t, but fields mogla and lgtxt are taken from t512w and t512t respectively.
All in all this is correct as far as up to 3-4 tables are concerned. But 10 will be a disaster...
Hope this helps you
Marcin

Creat View from Multiple tables , Multiple Select

Hello Everyone ,
I have a question and am not sure if this the correct forum to post it .
I have two table studentTable and CourseTable which is each student take more than one course . 1:M
for example Student1 take 2 courses (C1 , C2).
Student2 take 3 courses (C1,C2, C3).
I need to create a table/View that contain student information plus all the courses and the score for each course in one row.
for example
Row1= Student1_Id ,C1_code ,C1_name ,C1_Score ,C2_code,C2_name ,C2_Score
Row2=
Student2_Id,C1_code, C1_name,C1_Score,C2_code ,C2_name ,C2_Score , C3_code,C3_name,C3_Score
and since Student 1 just took two courses , I should enter NULL in 'Course 3 fields'
My Struggle is in the insert statement
I tried the following but it show an error
Insert Into Newtable
( St_ID, C1_code,c1_name, C1_Score ,C2_code ,C2_name,C2_score,C3_code ,C3_name,C3_score)
Select
(Select St_ID from StudentTable)
(Select C_code,c_name,c_Score
from Coursetable,SudentTable
where course.Stid =Studet.stid)
(Select C_code,c_name,c_Score
from course ,student
where course.Stid =Studet.stid ),
(Select C_code,c_name,c_Score
from course ,student
where course.Stid =Studet.stid );
I'm fully aware that the New table will break the rules of normalization ,but I need it in this way for specifc purpose.
I tried also the PIVOT BY functionality but no luck with it .
FYI , I'm not expert in using SQL Syntax , I just know the basic.
I will be great full for any helpfull suggestions to try ,
thank you very much.

First Table is Member table which Represent
Students Information
.The fields in this table are
member_sk (PrimaryKey), full_or_part_time, gender, age_at_entry, age_band_at_entry, disability, ethnicity,
widening_participation_level, nationality
Second Table is Modules table which include
the Courses' scores that Student took .
The fields in this table are
Module_result_k(Primary Key), member_sk(Foreign key to connect to Member table), member_stage_sk
,module_k(Foreign key to connect to Module table), module_confirmed_grade_src, credit_or_result
Third Table is
AllModuleInfo which is include
general information for each course .The fields in this table are
Module_k (Primary key), module_name ,module_code, Module_credit, Module stage.
The New table
that I will create has the following fields
member_sk (PrimaryKey), full_or_part_time, gender, age_at_entry, age_band_at_entry, disability, ethnicity,
widening_participation_level, nationality
" This will be retrieved from Member table"
Also will include
Module 1_name ,module1_code, Module1_credit, Module1_ stage, member1_stage_sk
, module1_confirmed_grade_src, credit1_or_result
Module 2_name ,module2_code, Module2_credit, Module2_ stage, member2_stage_sk
, module2_confirmed_grade_src, credit2_or_result
I will repeat this fields 14 times which is equal to Maximum courses number
that any of the students took.
//// I hope now my questions become more clear

Problem in creating a view over multiple tables

How do I create a View on top of the bCrelow tables. I have metioned the key fields of each table. How do i join the tables with common fields? I also need to create a Generic Extractor over the View later.
Z3PVR ( Custom Z table ):
Key Fields--> MANDT: Client; BUKRS: Company Code; WERKS: Plant; EBELN: Purchasing Document Number; ELNR: Accounting Document Number.
BSEG ( Cluster Table ):
Key Fields--> MANDT: Client; BUKRS: Company Code; BELNR: Accounting Document Number; GJAHR: Fiscal Year; BUZEI: Number of Line Item Within Accounting Document
CKIS ( Transparent Table ):
MANDT: Client; LEDNR: Ledger for Controlling objects; BZOBJ: Reference Object; KALNR: Cost Estimate Number for Cost Est. w/o Qty Structure; KALKA: Costing Type; KADKY: Costing Date (Key); TVERS: Costing Version; BWVAR: Valuation Variant in Costing; KKZMA: Costs Entered Manually in Additive or Automatic Cost Est.; POSNR: Unit Costing Line Item Number
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RV61A ( Structure ):
No Key
T001 ( Transparent Table ):
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Hi Chintai,
To create a view you can use Tcode SE11.
In the first screen of view creation you must introduce the tables for the view and the conditions of join, remember to introduce always the field MANDT.
You are introducing too much tables in your view and if I am not wrong you can not introduce Structures in a view.
As a suggestion start introducing in View only the tables that contain all char you need and also the tables with a reduced number of keys (as T001).
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To built up a Generic extractor on this view you can use Tcode RSO2.
You can find under www.service.sap.com/bi an How to doc on Generic DataSource creation.
Ciao.
Riccardo.

How to creat Data source from Multiple Tables in   SAP BI ?

Hi Experts,
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Hi,
Go for the generic data sources.
1. first create the view on all the tables.
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2. build the data source based on the view.
Regards,
Siva
Edited by: sivaramakrishna on Feb 2, 2012 3:54 PM

Microsoft Access 2010 Creating a Form from Multiple Tables

Hi.
I am brand new to Microsoft Access and have had some exciting success making forms from single tables. This has made my data entry life much easier. However, I am continually stumped on one form I want to make. I would like to make a form that will let me
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is stored in my Retailer table (linked to a RetailerID). I would like to be able to see the brand's name and the retailer's name when entering in data on a form, since I cannot remember the ids that associate with the names. I have been able to make a form,
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When I update this form, though, with a new record, it invariably thinks that I am adding an entirely new record, not
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Hi!
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Hi J,
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Crate view from multiple tables in mysql

does anybody know what the correct syntax is?
I need to do the following:
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You need to be using a version of MySQl that supports views, 5.0 or greater. This SQL will tell you which version you are using:
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http://dev.mysql.com/doc/refman/5.0/en/create-view.html

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null

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user12943718 wrote:
Hi,
I'm having existing oracle db with daily stat data, tables strangely named data_mon, data_tue, data_wed.. For my batch processing I plan to use view with multiple day data, let say for last 5 days.
Not sure how better implement my sql statement, with those _mon suffixes to make it more or less dynamic.
I also never create View from multiple tables, so probably I can do something that will add fresh daily data and delete 5 days old data?
Will appreciate you comments on details and whole concept. I have prev sql server experience.
Thanks
TChange the data model so you don't have 1 table for a day.
You just have a DATA table, and a column to denote the day of applicability.
Then you don't need a view, don't need anything dynamic, don't need to smash your head against a wall for a simple query ... etc.

Is selecting from a view more efficient than selecting from multiple tables

Hi heres the problem
Lets say i created a view from 2 tables (person and info). both have a ID column
create view table_view (age,name,status,id) as
select a.age, a.name, b.status, b.id
from person a, info.b
where a.id=b.idif i want to select a given range of values from these 2 tables which of the following queries would be more effective.
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from person a, info.b
where a.id=b.id
and a.id <1000
select age, name, status, id
from table_view
where id <1000

Bear in mind that this concept of views storing the SQL text is something relative to Oracle databases and not necessarily other RDBMS products. For example, Ingres databases create "views" as tables of data on the database and therefore there is a difference between selecting from the view and selecting from the base tables.
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Create a view from multiple tables

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