When a table type is defined, the key to be used for the table type must be specified.
You have the following options:
- Standard key
: The structure of the key depends on the row type category. In a structured row type, the standard key consists of all the character-like components of the table row. In an elementary row type or reference type as row type, the standard key consists of the entire table row. If the row type is a table type, the standard key is empty. Note that an empty key is only allowed for access mode Standard table.
- Row type
: The key consists of all the fields of the row type.
- Key components:
The key is explicitly defined by selecting components (fields) of the row type. This is only possible if a structure, table or view was selected as row type.
- Key not specified
: The key is not specified. This defines a
Key Definition of a Table Type 