Information about Table Type

Hi Guys,
What does Table Type mean?
What are uses of Table Type?
Regards,
Chandru

Hi
Analogous to the predefined ABAP types such as C or I , one may define user-defined types in the dictionary.
The following user-defined types are allowed
Data elements: Describe an elementary type by defining the data type, length and possibly decimal places.
Structures: Consist of components that can have any type.
Table types: Describe the structure of an internal table.
Elaboration on the type categories.
There are three different type categories in the ABAP Dictionary:
Data elements (elementary types) Elementary types have no structure. They describe the data type attributes (such as given Dictionary data type, number of places) and information that is relevant for the screen (such as title) of unstructured data objects (variables/fields).
Structures (structured types) Structured types describe the structure and functions of any structured data objects, that is of data structures with components of any type. A component can be a field with an elementary type or can itself be a structure. A table can also be used as a component in a structure. A database table always has a structure and is therefore implicitly a structured type. However, the fields of a database table can only have an elementary type.
Table types Table types describe the structure and functions of internal tables in the ABAP program. Their rows can have any row type. Table types with elementary row type therefore can be defined just the same as multi-dimensional table types (table types with a table type as row type) or table types using structures with table-like components.
Any complex user-defined type may be built using the
previously mentioned basic types.

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I want complete information about table maintanence genarator?

i want complete information about table maintanence genarator?

hi there,,,,,,,
The purpose of table maintainence generator is to enable the table maintenance through SM30, and to implement and validation etc on table field inputs.
SE11->Utillities->table maintainence generator
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To completely understand the difference and above points please do exercise by
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Link: http://help.sap.com/saphelp_nw04/helpdata/en/cf/21ed2d446011d189700000e8322d00/content.htm
Link: http://help.sap.com/saphelp_46c/helpdata/en/a7/5133ac407a11d1893b0000e8323c4f/frameset.htm
Link: /message/2831202#2831202 [original link is broken]
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Two step: Two screens namely the overview screen and Single screen are created. The user can see the key fields in the first screen and can further go on to edit further details.
pls reward if useful
regards,
rekha

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example
create or replace procedure xxx_proc as
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You are driving me crazy
y.empno(i) := i;This should be...
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Whats the important of " table-type " in sap abap?

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                            V
                    data types
V----
V                         V                                 V
data element       structure                   table type
i want to know about table type. plz give a brief idea.
bye.

hi,
Transparent Tables
A transparent table in the dictionary has a one-to-one relationship with a table in the database. Its structure in R/3 Data Dictionary corresponds to a single database table. For each transparent table definition in the dictionary, there is one associated table in the database. The database table has the same name, the same number of fields, and the fields have the same names as the R/3 table definition. When looking at the definition of an R/3 transparent table, it might seem like you are looking at the database table itself.
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Transparent tables are probably the only type of table you will ever create. Pooled and cluster tables are not usually used to hold application data but instead hold system data, such as system configuration information, or historical and statistical data.
Both pooled and cluster tables have many-to-one relationships with database tables. Both can appear as many tables in R/3, but they are stored as a single table in the database. The database table has a different name, different number of fields, and different field names than the R/3 table. The difference between the two types lies in the characteristics of the data they hold, and will be explained in the following sections.
Table Pools and Pooled Tables
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 (see Figure 3.2).
Pooled tables are primarily used by SAP to hold customizing data.
When a corporation installs any large system, the system is usually customized in some way to meet the unique needs of the corporation. In R/3, such customization is done via customizing tables. Customizing tables contain codes, field validations, number ranges, and parameters that change the way the R/3 applications behave.
Some examples of data contained in customizing tables are country codes, region (state or province) codes, reconciliation account numbers, exchange rates, depreciation methods, and pricing conditions. Even screen flows, field validations, and individual field attributes are sometimes table-driven via settings in customizing tables.
During the initial implementation of the system the data in the customizing tables is set up by a functional analyst. He or she will usually have experience relating to the business area being implemented and extensive training in the configuration of an R/3 system.
Table Clusters and Cluster Tables
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. The data is stored logically as shown in Figure 3.3.
Figure 3.3 : Table clusters store data from several tables based on the primary key fields that they have in common.
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.
For example, as shown in Figure 3.4, the first four primary key fields in cdhdr and cdpos are identical. They become the primary key for the table cluster with the addition of a standard system field pageno to ensure that each row is unique.
Reward if helpful
Jagadish

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Need information about Internal Tables

Hi Every one!
I Need some information about Internal tables. Pls help be above the same.
Thanks & with Regards,
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Hi..,

Internal tables 
Internal tables provide a means of taking data from a fixed structure and storing it in working memory in ABAP. The data is stored line by line in memory, and each line has the same structure. In ABAP, internal tables fulfill the function of arrays. Since they are dynamic data objects, they save the programmer the task of dynamic memory management in his or her programs. You should use internal tables whenever you want to process a dataset with a fixed structure within a program. A particularly important use for internal tables is for storing and formatting data from a database table within a program. They are also a good way of including very complicated data structures in an ABAP program.
Like all elements in the ABAP type concept, internal tables can exist both as data types and as data objects A data type is the abstract description of an internal table, either in a program or centrally in the ABAP Dictionary, that you use to create a concrete data object. The data type is also an attribute of an existing data object.
Internal Tables as Data Types
Internal tables and structures are the two structured data types in ABAP. The data type of an internal table is fully specified by its line type, key, and table type.
Line type
The line type of an internal table can be any data type. The data type of an internal table is normally a structure. Each component of the structure is a column in the internal table. However, the line type may also be elementary or another internal table.
Key
The key identifies table rows. There are two kinds of key for internal tables - the standard key and a user-defined key. You can specify whether the key should be UNIQUE or NON-UNIQUE. Internal tables with a unique key cannot contain duplicate entries. The uniqueness depends on the table access method.
If a table has a structured line type, its default key consists of all of its non-numerical columns that are not references or themselves internal tables. If a table has an elementary line type, the default key is the entire line. The default key of an internal table whose line type is an internal table, the default key is empty.
The user-defined key can contain any columns of the internal table that are not references or themselves internal tables. Internal tables with a user-defined key are called key tables. When you define the key, the sequence of the key fields is significant. You should remember this, for example, if you intend to sort the table according to the key.

Table type
The table type determines how ABAP will access individual table entries. Internal tables can be divided into three types:
Standard tables have an internal linear index. From a particular size upwards, the indexes of internal tables are administered as trees. In this case, the index administration overhead increases in logarithmic and not linear relation to the number of lines. The system can access records either by using the table index or the key. The response time for key access is proportional to the number of entries in the table. The key of a standard table is always non-unique. You cannot specify a unique key. This means that standard tables can always be filled very quickly, since the system does not have to check whether there are already existing entries.

Sorted tables are always saved sorted by the key. They also have an internal index. The system can access records either by using the table index or the key. The response time for key access is logarithmically proportional to the number of table entries, since the system uses a binary search. The key of a sorted table can be either unique or non-unique. When you define the table, you must specify whether the key is to be unique or not. Standard tables and sorted tables are known generically as index tables.

Hashed tables have no linear index. You can only access a hashed table using its key. The response time is independent of the number of table entries, and is constant, since the system access the table entries using a hash algorithm. The key of a hashed table must be unique. When you define the table, you must specify the key as UNIQUE.

Generic Internal Tables
Unlike other local data types in programs, you do not have to specify the data type of an internal table fully. Instead, you can specify a generic construction, that is, the key or key and line type of an internal table data type may remain unspecified. You can use generic internal tables to specify the types of field symbols and the interface parameters of procedures . You cannot use them to declare data objects.
Internal Tables as Dynamic Data Objects
Data objects that are defined either with the data type of an internal table, or directly as an internal table, are always fully defined in respect of their line type, key and access method. However, the number of lines is not fixed. Thus internal tables are dynamic data objects, since they can contain any number of lines of a particular type. The only restriction on the number of lines an internal table may contain are the limits of your system installation. The maximum memory that can be occupied by an internal table (including its internal administration) is 2 gigabytes. A more realistic figure is up to 500 megabytes. An additional restriction for hashed tables is that they may not contain more than 2 million entries. The line types of internal tables can be any ABAP data types - elementary, structured, or internal tables. The individual lines of an internal table are called table lines or table entries. Each component of a structured line is called a column in the internal table.

Choosing a Table Type
The table type (and particularly the access method) that you will use depends on how the typical internal table operations will be most frequently executed.

Standard tables
This is the most appropriate type if you are going to address the individual table entries using the index. Index access is the quickest possible access. You should fill a standard table by appending lines (ABAP APPEND statement), and read, modify and delete entries by specifying the index (INDEX option with the relevant ABAP command). The access time for a standard table increases in a linear relationship with the number of table entries. If you need key access, standard tables are particularly useful if you can fill and process the table in separate steps. For example, you could fill the table by appending entries, and then sort it. If you use the binary search option with key access, the response time is logarithmically proportional to the number of table entries.
Sorted tables
This is the most appropriate type if you need a table which is sorted as you fill it. You fill sorted tables using the INSERT statement. Entries are inserted according to the sort sequence defined through the table key. Any illegal entries are recognized as soon as you try to add them to the table. The response time for key access is logarithmically proportional to the number of table entries, since the system always uses a binary search. Sorted tables are particularly useful for partially sequential processing in a LOOP if you specify the beginning of the table key in the WHERE condition.

Hashed tables
This is the most appropriate type for any table where the main operation is key access. You cannot access a hashed table using its index. The response time for key access remains constant, regardless of the number of table entries. Like database tables, hashed tables always have a unique key. Hashed tables are useful if you want to construct and use an internal table which resembles a database table or for processing large amounts of data.
regards,
sai ramesh

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