Can any one give me brief explanation about internal tables, and workarea ?

SAP Reports,SAP DB,ALE, SAP Tables questions and answers

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Can any one give me brief explanation about internal tables, and workarea ?

*An internal table is a run time instance. It get created when program starts execution.
*It get destroyed when program terminates. It has two different parts: HeaderLine(optional) and Body(Compulsory).
*Any value that comes to or goes from interanal table, that travels through headerline.

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