Initial & Not initial concept in SAP ABAP

Initial & Not initial:

In SAP we use initial & not initial  keyword for internal table value check purpose.
Initial means there is no records in the internal table.
Like we  have an internal table as IT_Doc. so we use initial keyword as:
 
 if IT_doc is initial.

Give message " no record found".
endif.
 
Not initial:  At least one record is in there.
 
for similar internal table we can write :
 
If IT_Doc is not initial.
 
"then set logic to display the value".
 
endif. 

 

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