ABAP Keyword Documentation → ABAP Glossary
standard key
Primary table key of an internal table, whose key fields (if the row type is structured) are all table fields with character-like data types and byte-like data types. If the row type contains substructures, these are broken down into elementary components. The standard key for non-structured row types is the entire table row if the row type itself is not a table type. If there are no relevant table fields or if the row type is itself a table type, the standard key of standard tables is empty or contains no key fields.