internal tables

[Former Member]

Hi,

I am srikanth and need details of following:-

1.INDEX TABLE

2. HASHED TABLE

3. STANDARD TABLE

4.SORTED TABLE

Regards

Srikanth

[Former Member]

Refer this link:

http://help.sap.com/saphelp_nw2004s/helpdata/en/fc/eb35de358411d1829f0000e829fbfe/content.htm

Thanks,

Santosh

[Former Member]

Also these links:

http://www.sap-img.com/abap/what-are-different-types-of-internal-tables-and-their-usage.htm

Thanks,

Santosh

[ferry_lianto]

Hi Srikanth,

Types of Internal Tables:

1. STANDARD Table

Key access to a standard table uses a linear search. This means that the time required for a search is in linear relation to the number of table entries.

You should use index operations to access standard tables.

2. SORTED table

Defines the table as one that is always saved correctly sorted.

Key access to a sorted table uses a binary key. If the key is not unique, the system takes the entry with the lowest index. The runtime required for key access is logarithmically related to the number of table entries.

3. HASHED table

Defines the table as one that is managed with an internal hash procedure

You can only access a hashed table using the generic key operations or other generic operations ( SORT, LOOP, and so on). Explicit or implicit index operations (such as LOOP ... FROM oe INSERT itab within a LOOP) are not allowed.

4. INDEX table

A table that can be accessed using an index.

Index table is only used to specify the type of generic parameters in a FORM or FUNCTION. That means that you can't create a table of type INDEX.

Standard tables and sorted tables are index tables.

5. ANY table

Any table is only used to specify the type of generic parameters in a FORM or FUNCTION. That means that you can't create a table of type ANY.

Standard, sorted and hashed tables belongs to ANY tables.

Also please check this link for more information.

http://www.sap.info/goto/en/go/26902

Hope this will help.

Regards,

Ferry Lianto

[Former Member]

Hi srikanth,

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 NON-UNIQUE. 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.

http://help.sap.com/saphelp_erp2005/helpdata/en/fc/eb35de358411d1829f0000e829fbfe/frameset.htm

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