ABAP FAQ's

-> What is the Difference Between Tablecontrols and Step Loops?

Ans) Table controls have both horizontal and vertical scrollers and cursor control logic is designed implicitly.Step loops have only horizontal scrollers and cursor control logic is to be designed by the user explicitly.

-> Double click function on the lists, identifying the line selected by the user on the list.

Ans) SY_LSIND -> List levelSY-LILLI line number

-> what is the diff b/w start_form and open_form in scripts?.why is it necessary to close a form always once it is opened?

Ans) strat_form using this we can open many layoutsets
open_form using this we can open the layout
performance will be high

-> How many types of Standard Internal Tables?

Ans) STANDARD TABLE: The key is, by default, set to NON-UNIQUE. You may not use the UNIQUE addition. -
SORTED TABLE: Unlike stadard tables, sorted table have no default setting for the uniqueness attribute. If you do not specify either UNIQUE or NON-UNIQUE, the system defines a generic table type, where uniqueness is irrelevant. You can use generic types to specify the type of generic subroutine parameters. -
HASHED TABLE: Hashed tables have no default setting. You must use the UNIQUE addition with hashed tables. You may not use NON-UNIQUE.