Plz answer these interview Q's

Question

1.Difference b/w Modify and Update
2.How to find the corresponding by using the Function module(Zinclude)
3.How to use an internal table defined in the other program.
4.What is the use of Call CUSTOMER-FUNCTION ‘001’ which u can find in some
Standard function modules.
5. How many Tcodes(max) can be assigned to a Program
6. How to include a table field Check box in SM30
7. Use of Table Type
8. How to define select options in Dialog Programming
9.Difference b/w ABAP memory and SAP memory
10. how many text symbolw are there in SAP Script

Answer 1

hi,
Inserting or Changing Lines
To insert lines into a database table regardless of whether there is already a line in the table with the same primary key, use the following:
MODIFY <target> <lines>.
If the database table contains no line with the same primary key as the line to be inserted, MODIFY works like INSERT, that is, the line is added.
If the database already contains a line with the same primary key as the line to be inserted, MODIFY works like UPDATE, that is, the line is changed.
For performance reasons, you should use MODIFY only if you cannot distinguish between these two options in your ABAP program.
You can add or change one or more lines <lines> in a database table <target>. You can only insert or change lines in an ABAP Dictionary view if it only contains fields from one table, and its maintenance status is defined as Read and change. You may specify the database table <target> either statically or dynamically
To insert or change a single line in a database table, use the following:
MODIFY <target> FROM <wa> .
To insert or change several lines in a database table, use the following:
MODIFY <target> FROM TABLE <itab> .
To overwrite a single line in a database table with the contents of a work area, use the following:
UPDATE <target> FROM <wa> .
To overwrite several lines in a database table with the contents of an internal table, use the following:
UPDATE <target> FROM TABLE <itab> .
INDEX TABLE
For creating a generic table type with index access.
ANY TABLE
For creating a fully-generic table type.
Data types defined using generic types can currently only be used for field symbols and for interface parameters in procedures . The generic type INDEX TABLE includes standard tables and sorted tables. These are the two table types for which index access is allowed. You cannot pass hashed tables to field symbols or interface parameters defined in this way. The generic type ANY TABLE can represent any table. You can pass tables of all three types to field symbols and interface parameters defined in this way. However, these field symbols and parameters will then only allow operations that are possible for all tables, that is, index operations are not allowed.
Fully-Specified Table Types
STANDARD TABLE or TABLE
For creating standard tables.
SORTED TABLE
For creating sorted tables.
HASHED TABLE
For creating hashed tables.
Fully-specified table types determine how the system will access the entries in the table in key operations. It uses a linear search for standard tables, a binary search for sorted tables, and a search using a hash algorithm for hashed tables.
To know abt. text symbols in script:
http://www.sappoint.com/abap/sssymbl.pdf
reward if helpful.
regards,
keerthi.