Views in Data dictionary

[Former Member]

Hi frnds,

what is diffferent type and usage of views ?

regards,

satish

[Former Member]

We have 4 types of Views:

1) Database views

2) Projection views

3) Help views

4) Maintenance views

Database views:-Data about an application object is often distributed on several database tables. A database view provides an application-specific view on such distributed data.Database views are defined in the ABAP Dictionary. A database view is automatically created in the underlying database when it is activated.

a database view is implemented in the database, a database view may only contain transparent tables.

Projection View:-Projection views are used to hide fields of a table. This can minimize interfaces; for example when you access the database, you only read and write the field contents actually needed.

A projection view contains exactly one table. You cannot define selection conditions for projection views

Help views:-You have to create a help view if a view with outer join is needed as selection method of a search help.

Maintenance views:- Maintenance views offer easy ways to maintain complex application objects.

A maintenance view permits you to maintain the data of an application object together. The data is automatically distributed in the underlying database tables. The maintenance status determines which accesses to the data of the underlying tables are possible with the maintenance view.

database view alco not contain the data physicaly, you can look at the VIEWS in se11 byselecting the View. there you can not see the data for that view, but if you write a select statment the data retrived by the corresponding tables and will be displayed, but In the DATABASE view, when you write a select statment, it wil have the buffer facility, so the data will be stored in the buffers. so no view can contain the data physicaly

[ferry_lianto]

Hi,

The followings are different types of views:

<b>Database View</b> (SE11)

Database views are implement an inner join, that is, only records of the primary table (selected via the join operation) for which the corresponding records of the secondary tables also exist are fetched. Inconsistencies between primary and secondary table could, therefore, lead to a reduced selection set.

In database views, the join conditions can be formulated using equality relationships between any base fields. In the other types of view, they must be taken from existing foreign keys. That is, tables can only be collected in a maintenance or help view if they are linked to one another via foreign keys.

<b>Help View</b> (SE54)

Help views are used to output additional information when the online help system is called.

When the F4 button is pressed for a screen field, a check is first made on whether a matchcode is defined for this field. If this is not the case, the help view is displayed in which the check table of the field is the primary table. Thus, for each table no more than one help view can be created, that is, a table can only be primary table in at most one help view.

<b>Projection View</b>

Projection views are used to suppress or mask certain fields in a table (projection), thus minimizing the number of interfaces. This means that only the data that is actually required is exchanged when the database is accessed.

A projection view can draw upon only one table. Selection conditions cannot be specified for projection

views.

<b>Maintenance View</b> (SE54)

Maintenance views enable a business-oriented approach to looking at data, while at the same time, making it possible to maintain the data involved. Data from several tables can be summarized in a maintenance view and maintained collectively via this view. That is, the data is entered via the view and then distributed to the underlying tables by the system.

Also check this link for more information.

http://help.sap.com/saphelp_nw2004s/helpdata/en/cf/21ec5d446011d189700000e8322d00/content.htm

Hope this will help.

Regards,

Ferry Lianto

[Former Member]

Hi Satish,

Hope this helps.

Database View (SE11)

Database views are implement an inner join, that is, only records of the primary table (selected via the join operation) for which the corresponding records of the secondary tables also exist are fetched. Inconsistencies between primary and secondary table could, therefore, lead to a reduced selection set.

In database views, the join conditions can be formulated using equality relationships between any base fields. In the other types of view, they must be taken from existing foreign keys. That is, tables can only be collected in a maintenance or help view if they are linked to one another via foreign keys.

- Help View ( SE54)

Help views are used to output additional information when the online help system is called.

When the F4 button is pressed for a screen field, a check is first made on whether a matchcode is defined for this field. If this is not the case, the help view is displayed in which the check table of the field is the primary table. Thus, for each table no more than one help view can be created, that is, a table can only be primary table in at most one help view.

- Projection View

Projection views are used to suppress or mask certain fields in a table (projection), thus minimizing the number of interfaces. This means that only the data that is actually required is exchanged when the database is accessed.

A projection view can draw upon only one table. Selection conditions cannot be specified for projection views.

- Maintenance View ( SE54 )

Maintenance views enable a business-oriented approach to looking at data, while at the same time, making it possible to maintain the data involved. Data from several tables can be summarized in a maintenance view and maintained collectively via this view. That is, the data is entered via the view and then distributed to the underlying tables by the system.

Creating Database View:

http://help.sap.com/saphelp_nw2004s/helpdata/en/cf/21ed06446011d189700000e8322d00/content.htm

Creating Projection View:

http://help.sap.com/saphelp_nw2004s/helpdata/en/cf/21ecc5446011d189700000e8322d00/frameset.htm

Creating Help View:

http://help.sap.com/saphelp_nw2004s/helpdata/en/cf/21ecd2446011d189700000e8322d00/frameset.htm

Creating maintenance View:

http://help.sap.com/saphelp_nw2004s/helpdata/en/cf/21ecdf446011d189700000e8322d00/frameset.htm

http://help.sap.com/saphelp_webas620/helpdata/en/cf/21ec5d446011d189700000e8322d00/content.htm

There are lot many links in SDN as well as in google where u can get as much information as u want , so plzz check those things before posting.

if u hav any doubts then u can ask furthere.<b></b>

regards,

rajesh

[Former Member]

Hi ,

Frnds thnk u for giving valuable replies.

Actually i needed the steps for creating the views .

Thnk u again.

rewards,

satish