iSU ABAP Level 1 Internal Tables[1]

8/3/2019 iSU ABAP Level 1 Internal Tables[1]

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INTERNAL TABLES

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~ Madhusudan


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INTERNAL TABLES

These internal tables can be created as a

replica of data base table, using some or all

fields of one table or more tables.

These internal tables are created only during

run time. No memory is reserved.


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Why we need inttables?

Long Life data is stored in database tables. When we are

directly modifying data, there is every possibility that wemay loose data by accident, which we can not afford to doso. As such we need some intermediate tables to do some

operations. Up on satisfactory results, we can modifydatabase table


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Types of internal tables

Basically there are 2 types of Internal tables.

Internal tables with header line.

Internal tables without header line.


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Internal tables with header line

When you create internal table with header

line, a default work area is created.


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Internal table with out header line

In this case, we need to create explicit work

area to work with it. When we need to nest the tables with in

tables, we need to use this type of internal table.


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Steps in creating internal tables

There are 3 steps involved in creating Internal

tables.

Declaration of Internal table.

Populating Internal table.

Processing Internal table.


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Declaration of internal table

Declaring table type

1. Data dictionary

2. Using TYPES key word


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Using TYPES key word

TYPES: Begin of ,.

End of . First

DATA: TYPE OF

WITH {UNIQUE|NON-UNIQUE} KEY ]

[INITIAL SIZE ]

[WITH HEADER LINE].

Second


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TABKIND ( TABLE KIND)

1. STANDARD TABLE

2. SORTED TABLE

3. HASHED TABLE

4. INDEX TABLE

5. ANY TABLE

Which TABKIND to choose depends on how you are accessing the

Entries in the internal table.


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STANDARD TABLE

This table type is most appropriate when you intendto address the table entries using the index.

Key access to the standard table uses linear search.

This means that the time required for a search is inlinear relation to the number of table entries.

You should use index operations to access standardtables.


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SORTED TABLE

Defines the table as one that is always savedcorrectly sorted.

Key access to a sorted table uses a binary key.

You can also access sorted tables by indexoperations.

The time required for a search is in logarithmicalrelation to the number of table entries.


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HASHED TABLE

Defines the table as one that is managed with aninternal hash procedure.

You can imagine a hashed table as a set, whoseelements you can address using their unique key.

Unlike standard and sorted tables, you cannot access

hash tables using an index.

Access time using the key is constant, regardless ofthe number of table entries.


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INDEX TABLES

Standard and sorted tables belong to the generic classindex tables.

An index table is one that you can access using an index.


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ANY TABLE

The set of permitted operations for a table with type ANYTABLE consists of the intersection of all permittedoperations for STANDARD, SORTED and HASHED

TABLES, and so is identical to the set of operationspermitted for hashed tables.


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LINETYP ( LINE TYPE)

The line type of an internal table can be any ABAP datatype (including another internal table).

Line type gives the columns required for the internal table.


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Key

The key is used to identify lines in the table.

There are two possible keys for an internal table

1. The default key

2 User-defined key.

You can specify that the key should by

UNIQUE or NON-UNIQUE.

If the key is unique, the internal table may not containduplicate entries. The uniqueness of the key dependspartly on the table type.


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Populating internal tables

Selecting the fields from the standard table(s) and transferring them tothe internal table created.

For this we use SELECT STATEMENTS.


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PROCESSING INTERNAL TABLES

Processing of internal table includes:

Write

Read

Insert Modify

Delete

Collect


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PROCESSING INTERNAL TABLES CONTD

Other operations like..

Clear

Refresh

Free


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Write

loop at itab < where carried = LH >.

Write:/ itab-carrid,itab-connid,itab-fldate.

endloop.


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Loop At...

Carrid Connid FldateAA

AA

DL

0017

0026

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Internal Table

SCREEN


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Read Table

Carrid Connid FldateAA

AA

DL

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0026

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AA 0017 10/29/1998

Internal Table

Header line

Body


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Insert

itab-carrid = MN.

itab-connid = 1111.

insert itab index 3.


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Insert table

Carrid Connid Fldate

AA

AA

DL

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0026

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Header line

Body

Internal Table


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Modify

Header line Header line

Internal Table Internal Table

Modify


TABLE: SFLIGHT

AA

AA

ALDL

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0026

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AA 0017 AA

AA

AL

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0050

0026

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AA 0017 10/29/1998 AA 0050 10/29/1998(change)


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Delete

delete itab index 3.

OR

delete from itab where carrid = LH.


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Delete


Internal Table Internal Table

Modify


TABLE: SFLIGHT

AA 0017

0026

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AA

AA

AL

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AA 0017 10/29/1998 (delete) 10/29/19980017AA


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Initializing internal table

clear itab. : clears header of int table.

clear itab [ ]. : clears body.

refresh itab. : remove contents.

free itab : deallocates memory associated with int table.


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AA

AA

DL

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CLEAR

REFRESH

Clear - Refresh

Internal Table

Header line

Body


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Sorting of internal table

sort itab.

This command will sort internal table on all

non-numeric fileds in ascending

order.

sort itab by carrid.

sort itab by carrid descending.


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Sort


Database TableInternal Table

Body Body

Move

Appen

d

Carrid Connid Fldate Carrid Connid Fldate

TABLE: SFLIGHT

DL

AA

AL

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Collect itab

If non numeric fields are same, then numeric fields will be added byusing this command.


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Questions???


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Please complete the feed back form which will be sent across and sendit back to [email protected].

iGATE SAP UniversityMaking SAP Simple

THANKS!


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KEY CONTACTS:

Presenter : Madhusudan Rao Budati

[email protected]

iSU Team Details :

Pradeep Kumar Reddy Dinesh [email protected] [email protected]

Aswani Kumar Nune Madhusudan Rao Budati

[email protected] [email protected]

iSU ABAP Level 1 Internal Tables[1]

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