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A structure is defined in the ABAP/4 Dictionary like a table and can be accessed from
ABAP/4 programs. Any change to the definition of the structure in the ABAP/4 Dictionary
is automatically implemented in all programs.
While data in tables is stored permanently in the database, structures contain data only
during the runtime of a program.
Structures are used in abap/4 programs to transfer data between programs as it is
globally defined.Structures are used in particular for defining data at the interface
between module pools and screens and for standardizing parameters for function
modules.
What does an extract statement do in the Abap/4 program?
With the first EXTRACT statement of a report, the system creates the extract dataset
and adds the first extract record. With each subsequent EXTRACT statement, the
system adds another extract record to the extract dataset.
What is a collect statement and how is it different from the append statement?
To fill an internal table with lines which have unique standard keys, we use the
COLLECT statement.
If an entry with the same key already exists, the COLLECT statement does not append a
new line as APPEND statement, but adds the contents of the numeric fields in the work
area to the contents of the numeric fields in the existing entry.
What is an open SQL vs Native SQL.
Open SQL allows you to access all database tables known to the SAP system,
regardless of the database manufacturer. Sometimes, however, we may want to use
database-specific SQL statements called Native SQL in your ABAP/4 program.
To avoid incompatibilities between different database tables and also to make ABAP/4
programs independent of the database system in use, SAP has created a set of
separate SQL statements called Open SQL. Open SQL contains a subset of standard
SQL statements as well as some enhancements which are specific to SAP.
A database interface translates SAP's Open SQL statements into SQL commands
specific to the database in use. Native SQL statements access the database directly.
What does an EXEC SQL statement do in ABAP? What is the disadvantage of
using it?
To use a Native SQL statement, it must be preceded by an EXEC SQL statement and
concluded by an ENDEXEC statement.
An ABAP/4 program with Native SQL statements does not generally run with different
databases.
What are the events used in ABAP4?
The events are
· INITIALIZATION
· AT SELECTION-SCREEN
· AT SELECTION-SCREEN ON <field>
· START-OF-SELECTION
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