System's Form Table and Item Table

Hi guys,
Where in the DB can I find the table that holds all the properties for the System Forms in SBO?
Thanks

when you are looking for the
column preferences -> CPRF
user display categories -> CUDC
or are you looking for something else ?
regards
David

Similar Messages

How to create procedure for header table and item table

Hi,
Can anyone help me to understand how to write SQLscript procedure for looping item table inside header table?
I fetch records from sales header table ( order number ) and using that order number to loop sales item table,thereafter I need to perform business logic.
Any example similar above requirement would be helpful
thanks
Sourav

Hi Folks,
This is my use case
1) Select fact records from tables (say A,B,C,D ) with suitable Joins and certain Where conditions
SELECT ordid FROM TABLES A,B,C,D on join condition where ....
2) Using above header records , I have to select each and every item level data from different tables ( say X,Y,Z ) and perform calculation to derive new columns to update a new table ( Zreport )
UPDATE TABLE ZREPORT
SET col1 = ( Select qty FROM TABLE X WHERE ordid = A.ordid
UPDATE TABLE ZREPORT
SET col2 = ( Select price FROM TABLE y WHERE ordid = B.ordid.
and so on for other columns..
3) Zreport table will be used for reporting.
I would like to know the best way to achieve this to gain performance.
Appreciate the help!
Thanks
Sourav

Header and Item table - Form Design Question

Hi All,
I have a header table and Item table. For every record in the header table I have multiple records in the item table. I want to have a adobe form in the following way
1. A new page starts for every record in the header table and Items in the item table for this header record can span multiple pages with the same header information.
2. When all the items are displayed for that particular header record, a new page should start for the next header record.
I created one internal table in the following way
Header_field1 Header_field2 Item_table(with all the items for this header record)
Header_field1 Header_field2 Item_table(with all the items for this header record)
I am not sure how to use a table for this scenario (Should It be a nested table?).
Please provide me some ideas.
Thanks,
Ganesh.

Hi Balasubramani,
I made some changes and have the following now. Can you please let me know how I can achieve page break for every BP_NUMBER.
I have a nested table like the one below.
Main table u2013 Has header and Items information. Every header record has some header information like BP number, name and all line items for that BP in a nested table .
IT_HEADER:
BP_NUMBER     BP_NAME           IT_ITEMS(Items table)
BP_NUMBER     BP_NAME           IT_ITEMS
BP_NUMBER     BP_NAME           IT_ITEMS
To display this information I created the following
Subform1 u2013 overflow u2013bound to $record.IT_HEADER.DATA[*] u2013 (Repeat sub form for
|                                             each data item)
|->Header sub form u2013 Positioned
|     |
|     |-> Text Field u2013 bound to BP_NUMBER
|
|
|->Item sub form -
     |
     |->Item Table u2013 bound to IT_ITEMS
          |
          |->Data u2013 bound to IT_ITEMS.DATA[*] u2013(Repeat row for each data item)
In the output BP number in the first record of IT_HEADER gets displayed and then all the Item records in IT_ITEMS for that BP get displayed. This is repeated all the records in IT_HEADER which is perfectly fine.
Please provide me some suggestions to solve the following issues I am having
1.     I need a page break between records of IT_HEADER. I want the new subform1 for the next header record to start in a new page. I tried conditional break option, on the only field BP number in header sub form. I have two master pages and two body pages. All the above information is in master page 2 and body page 2. I am also not sure what to select in the TO section of the conditional break screen.
2.     When there is an overflow in IT_ITEMS I need the Header sub form to be shown in the next page too.
Thanks,
Ganesh.

Opportunity Header and Item tables

I am looking at the keys on the Opportunity Header and Item table which are GUIDs.
I have the following scenario.
1. My source table contains the Opportunity Header GUID
2. My target table requires all the fields from the source table and some Opportunity Header and Item attributes
I can write WHERE clause logic for my Opportunity Header attributes
For my Opportunity item attributes I was going to introduce a count - this is not possible with Item GUID unless a part of the GUID is incremental for each line by 1 or there is a maintained field otherwise as part of the Opportunity Item which is a number representation for each line.
Can someone advise
Thanks

Hi,
In the CRMD_ORDERADM_H table you have the Opportunity GUID as well as the Object ID which is the opportunity id. In the CRMD_ORDERADM_I table, you have the GUID and also the NUMBER_INT which is the item number. See if you can use the item number.
Thanks.

Mapping Hearder and Item table

Hi Guys,
I have two internal tables one contain header data with over 20 fields and other item with 4 fields.
I want to map 2 fields of item table into header table appending into header, but I also want the other fields from header table also to be in the new enteries. How can I do that or is there any way out??
TIA,
Nitin

Hi,
The 2 tables refer to the same object(assume some document no) ,then header & item will have a field representing the same document number.
Then you can create another internal table with all the needed fields.
while looping data from header table ,read item table with reference to same document (as the header record documnet). & pass values of that table to new internal table.also pass values of header table to new table. Then append records in new table.
Hope this helps.
Thanks.
Mark points if helpful.

Difference between header and item table

hi experts
I have doubt in choosing header and item table. what is the difference between them. on what situations they can be choosed, how can i conclude that my object needs only item or header table.
thanks in advance.
maaya

Hi
Header will be always a single time data in a transaction
where as Item data is Multiple lines of data
Item data in most of the times consists of more number of lines.
see the header and Item related tables for some Tcodes
Tcode      Header   Item
VA01       VBAK    VBAP Sales order
VL01N     LIKP       LIPS    Delivery
VF01       VBRk      VBRP   Invoice/Billing Doc
ME21N    EKKO     EKPO   Pur order
Regards
Anji

Attach User define tables and view table need add to database into my add-o

Hi there,
I want to deploy an addon, there are User define tables and view table need add to database.
I need some advice on some issues..
1. Can I attach User define tables and view table need add to database into my addon.
2. I wonder which chance is properly to add them, if add these user define objects in time of install and I can't get the enough information that connect to SQL server
Thanks for any help.

Hi Weerachai,
Here's an example of how to create a user-defined table in code. My suggestion would be to check if it exists when your add-on starts up and then if not, create the tables, fields and objects.
'User Table
 Private Sub CreateTable(ByVal sTable As String, ByVal sDescription As String, ByVal oObjectType As SAPbobsCOM.BoUTBTableType)
 Dim oUserTablesMD As SAPbobsCOM.UserTablesMD
 Dim iResult As Long
 Dim sMsg As String
 oUserTablesMD = oCompany.GetBusinessObject(SAPbobsCOM.BoObjectTypes.oUserTables)
 If Not oUserTablesMD.GetByKey(sTable) Then
 oUserTablesMD.TableName = sTable
 oUserTablesMD.TableDescription = sDescription
 oUserTablesMD.TableType = oObjectType
 iResult = oUserTablesMD.Add()
 If iResult <> 0 Then
 oCompany.GetLastError(iResult, sMsg)
 MessageBox.Show("Error Creating Table: " & sTable & " Error: " & sMsg)
 End If
 End If
 System.Runtime.InteropServices.Marshal.ReleaseComObject(oUserTablesMD)
 End Sub
'User Field
 Private Sub CreateField(ByVal sTable As String, ByVal sName As String, ByVal sDescription As String, _
 ByVal iSize As Integer, ByVal aFieldType As SAPbobsCOM.BoFieldTypes, _
 ByVal aSubType As SAPbobsCOM.BoFldSubTypes, ByVal sLink As String, _
 ByVal bMandatory As SAPbobsCOM.BoYesNoEnum)
 Dim oUserFieldsMD As SAPbobsCOM.UserFieldsMD
 Dim oTable As SAPbobsCOM.UserTable
 Dim iResult As Long
 Dim sMsg As String
 Dim i As Integer
 Dim x As Integer
 Dim bFound As Boolean = False
 Dim oField As SAPbobsCOM.Field
 oTable = oCompany.UserTables.Item(sTable)
 For i = 0 To oTable.UserFields.Fields.Count - 1
 oField = oTable.UserFields.Fields.Item(i)
 'MessageBox.Show(oField.Name)
 If oField.Name = "U_" & sName Then
 bFound = True
 End If
 Next
 System.Runtime.InteropServices.Marshal.ReleaseComObject(oTable)
 If Not bFound Then
 oUserFieldsMD = oCompany.GetBusinessObject(SAPbobsCOM.BoObjectTypes.oUserFields)
 oUserFieldsMD.TableName = "@" & sTable
 oUserFieldsMD.Name = sName
 oUserFieldsMD.Description = sDescription
 oUserFieldsMD.Type = aFieldType
 If aFieldType = SAPbobsCOM.BoFieldTypes.db_Alpha Or aFieldType = SAPbobsCOM.BoFieldTypes.db_Numeric Then
 oUserFieldsMD.EditSize = iSize
 Else
 oUserFieldsMD.SubType = aSubType
 oUserFieldsMD.Mandatory = bMandatory
 End If
 oUserFieldsMD.LinkedTable = sLink
 iResult = oUserFieldsMD.Add()
 If iResult <> 0 Then
 oCompany.GetLastError(iResult, sMsg)
 MessageBox.Show("Error Creating Field: " & sTable & "." & sName & " Error: " & sMsg)
 End If
 System.Runtime.InteropServices.Marshal.ReleaseComObject(oUserFieldsMD)
 End If
 End Sub
If you want to create a View I think you would have to use the RecordSet object. This will ensure that you don't have to log in to the database again
Hope it helps,
Adele

Deleted and adjusted the Master data table, sid table and text table

Deleted and adjusted the master data table, sid table and text table of an zinfoobject after removing and adding attributes to that zinfoobject and was trying to activate it and system was giving me messages that cannot activate infoobject something like this.
So, i deleted and adjusted the master data table, sid table and text table. Since then getting messages right after executing the query because in that query that infoobject is getting used.
So the messages i am getting is:
SID 9 for characteristic Zinfoobject could not be converted CL_RSDM_READ_MASTER_DATA->_SIDVAL_DIRECT_READ2
System error in program SAPLRRK0 and form MEGA_SORT_M_02-02- (see long text)
Please help me in fixing this whole thing.
Thanks
SAPBW

SAP BW,
After adjusting your Master Data IOBJ and deleting and reloading the data - run a change run to adjust the references to the SIDs and then see if your query runs - run program RSDDS_AGGREGATES_MAINTAIN from se38 and select your IOBJ in the next screen..
Arun
Assign points if useful
P.S I did notice that in your earlier post for the same topic - you have had 12 answers / suggestions Please maintain only one thread as previously suggested..
My 0.02
Message was edited by:
Arun Varadarajan

Wat is the exact differences between clustered table and pooled table

hi,
can you tell me ravi...wat is the exact differences between clustered table and pooled table
with regards//
anilreddyg

Hi Anil Reddy
Pooled Tables, Table Pools, Cluster Tables, and Table Clusters
These types of tables are not transparent in the sense that they are not legible or manageable directly using the underlying database system tools. They are managed from within the R/3 environment from the ABAP dictionary and also at runtime when they are loaded into application memory.Pool and cluster tables are logical tables. Physically, these logical tables are arranged as records of transparent tables. The pool and cluster tables are grouped together in other tables, which are of the transparent type. The tables that group together pool tables are known as table pools, or just pools; similarly, table clusters, or just
clusters, are the tables which group cluster tables.Not all operations that can be performed over transparent tables can be executed over pool or cluster tables.
For instance, you can manage these tables using Open SQL calls from ABAP, but not Native SQL.These tables are meant to be buffered and loaded in memory, because they are commonly used for storing internal control information and other types of data with no external (business) relevance. SAP recommends that tables of pool or cluster type be used exclusively for control information such as
program parameters, documentation, and so on. Transaction and application data should be stored in transparent tables.
Table Pools
From the point of view of the underlying DBMS as from the point of view of the ABAP dictionary, a table pool is a transparent table containing a group of pooled tables which, when created, were assigned to this table pool.
Field Type Description
TABNAME CHAR(10) Table name
VARKEY CHAR(n) Maximum key length n =< 110
DATALN INT2(5) Length of the VARDATA record returned
VARDATA RAW(m) Maximum length of the data varies according to DBMS
Table Clusters
Similarly to pooled tables, cluster tables are logical tables which, when created, are assigned to a table cluster. Therefore, a table cluster, or just cluster, groups together several tables of type clusters.Several logical rows from different cluster tables are brought together in a single physical record. The records
from the cluster tables assigned to a cluster are thus stored in a single common table in the database.A cluster contains a transparent cluster key which must be located at the start of the key of all logical cluster tables to be included in the cluster. As well, a cluster contains a long field (VARDATA), which contains the
data of the cluster tables for this key. If the data does not fit into a field, continuation records are created.
Field Type Description
CLKEY1 CHAR(*) First key fields
CLKEY2 CHAR(*) Second key field
CLKEYN CHAR(*) nth key field
PAGENO INT2(5) Number of the next page
TIMESTMP CHAR(14) Time stamp
PAGELG INT2(5) Length of the VARDATA record returned
VARDATA RAW(*) Maximum length of the data section; varies according to database system
Working with Tables
The dictionary includes many functions for working with tables. There are five basic operations you can perform on tables: display, create, delete, modify, copy. Please do not confuse displaying a table with displaying the table entries (table contents). In order to display a table, it must previously exist; otherwise the system will display an error message in the status bar. For the following example, the table TABNA is used. To display this table, from the main dictionary screen, enter the table name in the Object name
input field with the radio button selected next to Tables. Then, click on the Display button at the bottom of the screen, or press the F7 function key, or, alternatively,
select Dictionary object Display from the menu.
In this screen, you can see table information such as
¨ Table type, shown next to the name of the object. In the example, it is a transparent table.
¨ Short text description.
¨ Name of the user who made the last change, and the date of the change.
¨ Master language.
¨ Table status. On the screen, you can see this table is saved and active.
¨ Development class. For information on development classes, refer to Chap. 6.
Delivery class, which sets the maintenance group for the table. It controls how tables will behave during client copy procedures, upgrades, and so forth.¨
Tab. Maint. Allowed flag, which indicates whether you can generate a screen for maintaining table entries.
¨Then, on the lower part of the screen, you can see the table fields with all associated characteristics such as:
¨ Field name.
¨ Key indicator. When set, this field is the primary key, or part of it.
¨ Data element.
¨ Basic data type.
¨ Length.
¨ Check table.
¨ Short text, describing the field.
Additional information about the table can be displayed by selecting the corresponding functions from the menu or directly from the application toolbar, such as keys, indexes, or technical settings
Standard table:
The key access to a standard table uses a sequential search. The time required for an access is linearly dependent on the number of entries in the internal table.
You should usually access a standard table with index operations.
Sorted table:
The table is always stored internally sorted by its key. Key access to a sorted table can therefore use a binary search. If the key is not unique, the entry with the lowest index is accessed. The time required for an access is logarithmically dependent on the number of entries in the internal table.
Index accesses to sorted tables are also allowed. You should usually access a sorted table using its key.
Hash table:
The table is internally managed with a hash procedure. All the entries must have a unique key. The time required for a key access is constant, that is it does not depend on the number of entries in the internal table.
You cannot access a hash table with an index. Accesses must use generic key operations (SORT, LOOP, etc.).
Index table:
The table can be a standard table or a sorted table.
Index access is allowed to such an index table. Index tables can be used to define the type of generic parameters of a FORM (subroutine) or a function module.
Just have a look at these links:
http://help.sap.com/saphelp_nw04/helpdata/en/90/8d7304b1af11d194f600a0c929b3c3/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/74/83015785d811d295a800a0c929b3c3/frameset.htm
Regards
Sreeni

How can I get data in flat file from Pool table and cluster table ?

Hi,
I am working in one Achiving project. My requirement is to get data into flat file from Cluster table and pool table.
Is there any tool avilable to download data into flat file from pool table and cluster table ?
if table name given in the selection screen then data will be downloaded into flat file.
waiting for quick response.
Best Regards,
Bansidhar

Data cannot be retrived directly form the cluster table
as the Cluster results are stored in Cluster Key say for example PCLkey
and form that Key we need to fetch the data
these clustes are not the part of PNP or PNPCE tables
for ur info kindly check

Fact Table and Dimension Tables

Hi Experts, I'm creating custom InfoCubes for data coming from non-SAP source systems. I have two InfoCubes. Tha data is coming from like 10 tables. I have 10 DataSources created fo this and the data will be consolidated in Standard DSO before it will flow into 2 InfoCubes.
Now client wants to know before how much data will be there in InfoCubes in Fact table nad Dimension tables in both the InfoCubes. I have the total size of all the 10 tables from the sources given to me by the DBA. I wan not sure how I can convert that info for Fact table and Dimension table as I have not yet created these Infocubes.
Please help me with this on how I should address this.

hi,
The exact data will be hard to give however you can reach at a round figure in your case.
You are consolidating the data from the tables that means that there is relation between the tables. Arrive at a rough figure based on the relation and the activity you are performing while consolidating the data of the tables.
For example, let us say we want to combine data for sales order and deliveries in a DSO.
Let Sales order has 1000 records and Delivery has 2000 records. Both the tables have a common link (Sales Order).In DSO you are combining the data that means the data will be at the most granular level consist of Delivery data, so the maximum no of records which the consolidated DSO can have is 2000.
regards,
Arvind.

Reg: Fact table and Dimension table in Data Warehousing -

Hi Experts,
I'm not exactly getting the difference between the criteria which decide how to create a Fact table and Dimension table.
This link http://stackoverflow.com/questions/9362854/database-fact-table-and-dimension-table states :
Fact table contains data that can be aggregate.
Measures are aggregated data expressions (e. Sum of costs, Count of calls, ...)
Dimension contains data that is use to generate groups and filters.
This's fine but how does one decide which columns to consider for Fact table and which columns for Dimension table?
Any help is much appreciated.
Pardon me if this's not the correct place for this question. My first question in the new forum.
Thanks and Regards,
Ranit Biswas

ranitB wrote:
But my main doubt was - what is the criteria to differentiate between columns for Fact tables and Dimension tables? How can one decide upon the design?
Columns of a fact table will often be 'scalar' attributes of the 'fact' data item. A dimension table will often be 'compound' attributes of a 'fact'.
Consider employee information. The EMPLOYEE table can be a fact table. It might have scalar attribute columns such as: DATE_HIRED, STATUS, EMPLOYEE_ID, and so on.
Other related information that can't be specified as a single attribute value would often be stored in a 'dimension' table: ADDRESS, PHONE_NUMBER.
Each address requires several columns to define it: ADDRESS1, ADDRESS2, CITY, STATE, ZIP, COUNTRY. And an employee might have several addresses: WORK_ADDRESS, HOME_ADDRESS. That address info would be stored in a 'dimension' table and only the primary key value of the address record would be stored in the EMPLOYEE 'fact' table.
Same with PHONE_NUMBER. Several columns are required to define a phone number and each employee might have several of them. The dimension tables are used to help 'normalize' the data in the employee 'fact' table.
And that EMPLOYEE table might also be a DIMENSION table for other FACT tables. A DEVELOPER table might have an EMPLOYEE_ID column with a value that points to a 'dimension' row in the EMPLOYEE dimension table.

DATA BASE TABLE AND INTERNAL TABLE

Dear Friends,
please help me out in getting complete information about database table and internal table.
you can email me at < Removed by moderator - please maintain e-mail iDs in Business Card>
Message was edited by:
Arun Varadarajan

Hi Hazi,
DATABASE Tables :
This are the tables which are stored in the database (eg Oracle , informix , DB2 etc..) Physically. u can view it from T-codes SE11 or SE16. here in SE11 u can create ur own Transparent table.
for more information...
http://www.sapbrainsonline.com/TUTORIALS/TECHNICAL/dictionary_tutorial.html
Internal Tables.
While generating reports or other objects we are not modifying the database tables directly first we are selecting the data of the database table into the internal tables... so that we can reduce the database access time and network traffic .. which is highly needed in R/3 system..
internal tables are not exist phyiscally in the system. its like a array. the existance of the internal tables is upto the program execution in which u r declaring nd using it...
for more information..
http://www.sapbrainsonline.com/TUTORIALS/TECHNICAL/internaltables_tutorial.html
Hope it will solve ur problem..
Reward points if useful..
Thanks & Regards
ilesh 24x7

Check table and value table -Example

Hi Experts
Please give me the step by step procedure to create the check table and value table, and how to work on it.
Thanks in advance.
Regards
Rajaram

Hi
Check Table is for Field level Validation whereas Value table is for Domain Level Validations.
Value Table proposes table for check table.
I think you are clear with this.
more elaborate.
Check Table
The Check Table is the table used by system to check if a data exist or not exist.
While creating a table if you want to be sure that a field can have some values
and these are in a certain table, you can give IT this table as CHECK TABLE.
Value Table
This is maintained at Domain Level.
When ever you create a domain , you can entered allowed values. For example you go to Domain SHKZG - Debit/credit indicator.
Here only allowed values is H or S.
When ever you use this Domain, the system will forces you to enter only these values.
This is a sort of master check . .
To be maintained as a customization object.
This mean that if you want to enter values to this table you have to create a development request & transport the same.
Differences:
1)check table will carry out the check for input values for the table field being entered in any application
and value table will provide values on F4 help for that table field.
2)The check table defines the foreign keys and is part of the table definition.
The value table is part of the domain definition.
check table is validation at field level.
value table is at domain level.
Value table is defined at the domain level and is used to provide F4 help for all the fields which refer to that domain.
Check table is defined against a field in SE11 if you want the values in that field to be checked against a list of valid values. For e.g. if you are using the field matnr in a table you could define MARA as the check table.
Also while defining a check table SAP proposes the value table as check table by default. Referring to the previous example if you tried to define a check table for the matnr field SAP would propose MARA as the check table.
1. what is the purpose / use ?
-- so that the user can select values
from some master table , for that field !!!!
2. This is done by
CHECK TABLE (foreign key concept)
(and not value table)
3. When we create a check table for a field,
then
some DEFAULT table is PROPOSED
4. that DEFAULT table is nothing
but PICKED up from the domain of that field,
and shown from the value of VALUE TABLE.
CHECK TABLE -it is a parent table.
for example..
i have two tables ZTAB1 and ZTAB2.
I have one common field in both the tables,i can make any ztable to be the check table .If i make Ztab1 to be the check table then when i have to make an entry in ztab2 i will check whether ztab1 is having that value or not..
its also field level checking..
Valuetable-It is nothing but default check table.
one parent can have n number of child tables.For example
For ztable we have zchild1 and zchild2 tables r there.
Its domain level checking..When zchild2 uses the same domain as used by zchild1 then the system automatically generates a popup saying a check table already exists would u want to maintain it.
go to domain and then press the value tab u can see the valuetable at the end...
Please refer the links below,
d/r b/n check and value table?
wjhat is the exct difference between check table and value table
what is the check table and value table
check table and value table
Re: wjhat is the exct difference between check table and value table
http://www.sap-img.com/abap/difference-between-a-check-table-and-a-value-table.htm

Inforation on Pool tables and cluster tables required.

I want to know about the pool tables and cluster tables like how to create them and how to look the tables associated with the given tables. Like for the table BSEG we have other tables linked BSID etc. I'm new to this concept please guide me.

Pooled Table:
A pooled table in R/3 has a many-to-one relationship with a table in the database (see Figures 3.1 and 3.2). For one table in the database, there are many tables in the R/3 Data Dictionary. The table in the database has a different name than the tables in the DDIC, it has a different number of fields, and the fields have different names as well. Pooled tables are an SAP proprietary construct.
When you look at a pooled table in R/3, you see a description of a table. However, in the database, it is stored along with other pooled tables in a single table called a table pool. A table pool is a database table with a special structure that enables the data of many R/3 tables to be stored within it. It can only hold pooled tables.
R/3 uses table pools to hold a large number (tens to thousands) of very small tables (about 10 to 100 rows each). Table pools reduce the amount of database resources needed when many small tables have to be open at the same time. SAP uses them for system data. You might create a table pool if you need to create hundreds of small tables that each hold only a few rows of data. To implement these small tables as pooled tables, you first create the definition of a table pool in R/3 to hold them all. When activated, an associated single table (the table pool) will be created in the database. You can then define pooled tables within R/3 and assign them all to your table pool.
Pooled tables are primarily used by SAP to hold customizing data.
Cluster Table:
A cluster table is similar to a pooled table. It has a many-to-one relationship with a table in the database. Many cluster tables are stored in a single table in the database called a table cluster.
A table cluster is similar to a table pool. It holds many tables within it. The tables it holds are all cluster tables.
Like pooled tables, cluster tables are another proprietary SAP construct. They are used to hold data from a few (approximately 2 to 10) very large tables. They would be used when these tables have a part of their primary keys in common, and if the data in these tables are all accessed simultaneously.
Table clusters contain fewer tables than table pools and, unlike table pools, the primary key of each table within the table cluster begins with the same field or fields. Rows from the cluster tables are combined into a single row in the table cluster. The rows are combined based on the part of the primary key they have in common. Thus, when a row is read from any one of the tables in the cluster, all related rows in all cluster tables are also retrieved, but only a single I/O is needed.
A cluster is advantageous in the case where data is accessed from multiple tables simultaneously and those tables have at least one of their primary key fields in common. Cluster tables reduce the number of database reads and thereby improve performance.
Restrictions on Pooled and Cluster Tables
1. Pooled and cluster tables are usually used only by SAP and not used by customers, probably because of the proprietary format of these tables within the database and because of technical restrictions placed upon their use within ABAP/4 programs. On a pooled or cluster table:
2. Secondary indexes cannot be created.
3. You cannot use the ABAP/4 constructs select distinct or group by.
4.You cannot use native SQL.
5.You cannot specify field names after the order by clause. order by primary key is the only permitted variation.
For creation of pooled /cluster table, have a look at below link.
http://help.sap.com/saphelp_erp2004/helpdata/en/81/415d363640933fe10000009b38f839/frameset.htm
For creation of table pool /cluster, have a look at below link.
http://help.sap.com/saphelp_erp2004/helpdata/en/81/415d363640933fe10000009b38f839/frameset.htm
Have a look at below link.
http://www.sap-img.com/abap/the-different-types-of-sap-tables.htm
Best Regards,
Vibha
*Please mark all the helpful answers

System's Form Table and Item Table

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