Internal Tables are standard data type objects which exist only during the Runtime of an ABAP program. They are used to perform table calculations on subsets of database tables and for re-organizing the contents of database tables according to a user’s need. Internal tables fulfill the need for arrays in ABAP.
There are three types of internal tables:
- Standard Tables with a ‘linear’ index. The key is always ‘non-unique.’
- Sorted Tables with either a ‘unique’ or ‘non-unique’ key.
- Hashed Tables (they do not have a linear index) with the key defined always as ‘unique.’
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