ABAP Keyword Documentation →  ABAP − Reference →  Processing Internal Data →  Internal Tables →  Internal Tables - Overview 

Table Keys

Internal tables always have a primary key and can have up to 15 optional secondary table keys. Standard tables are automatically assigned a standard key if an explicit primary key is not defined.

• primary table keys

• secondary table keys

• duplicates for unique keys

• duplicates for non-unique keys

Other versions: 7.31 | 7.40 | 7.54

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Primary Table Keys

Secondary Table Key

Duplicate Unique Keys

Duplicate Non-Unique Keys